Из-за шума в переходе я снова не расслышала, к какому перрону нам идти, и попросила подругу подсказать.

Из-за here means because of.

It requires the genitive case, so:

• шум = noise
• из-за шума = because of the noise

Be careful: из-за can also literally mean from behind, depending on context. In this sentence, though, it clearly means because of.

So:

• из-за дома = from behind the house
• из-за дождя = because of the rain

Here it is the second meaning: because of the noise.

Переход can mean a passageway, underpass, or a connecting walkway in a station or metro area.

So в переходе means in the passage / in the underpass / in the station passageway.

The form переходе is prepositional singular, because it follows в when talking about location:

• переход = passageway
• в переходе = in the passageway

This is a common pattern:

• в доме = in the house
• в метро = in the metro
• в переходе = in the passageway

Both verbs relate to hearing, but they are not exactly the same.

• услышать = to hear
• расслышать = to make out clearly, to catch what was said, to hear distinctly

So не расслышала suggests:

• she heard that someone was speaking or that an announcement was being made,
• but she could not clearly make out the important information.

That fits the context of station noise very well.

Compare:

• Я не услышала звонок. = I didn’t hear the bell/ring at all.
• Я не расслышала, что он сказал. = I didn’t catch what he said clearly.

That ending shows past tense feminine singular.

In Russian past tense, verbs agree with the gender and number of the subject:

• я расслышал = I heard clearly / I caught it (male speaker)
• я расслышала = I heard clearly / I caught it (female speaker)

So this sentence tells you that the speaker is female.

The same thing happens with попросила:

• я попросил = I asked (male)
• я попросила = I asked (female)

Снова means again.

In this sentence:

• я снова не расслышала = I again didn’t catch / I once again couldn’t make out

It shows that this was not the first time.

Its position is flexible, but placing it before the verb is very natural:

• я снова не расслышала
• я не расслышала снова would sound much less natural here

Russian word order is fairly flexible, but снова often goes near the verb it modifies.

Because к какому перрону нам идти is a subordinate clause: an indirect question.

The speaker did not catch which platform they should go to, and that whole idea is expressed as a clause.

So the sentence is structured like:

• я не расслышала, ...
• I didn’t catch ...

And what she didn’t catch is:

• к какому перрону нам идти = which platform we should go to

Russian normally separates such subordinate clauses with a comma.

Compare:

• Я не знаю, где он живёт. = I don’t know where he lives.
• Она спросила, когда поезд отправляется. = She asked when the train leaves.

Because the preposition к requires the dative case.

The basic form is:

• какой перрон = which platform

But after к:

• к какому перрону = to which platform

Both words change because the whole phrase is in the dative:

• какой → какому
• перрон → перрону

This is exactly the same pattern as:

• к какому дому = to which house
• к какому врачу = to which doctor

Because the idea is go to a platform, not be on a platform.

Russian often expresses destination with к + dative when moving toward a place or point:

• идти к выходу = go to the exit
• подойти к окну = come up to the window
• к какому перрону нам идти = which platform we should go to

In English you just say to which platform, and Russian uses к to express that destination.

They are related, but not always identical in use.

• перрон usually refers to a railway platform area at a station
• платформа can also mean platform, and in many contexts it is more general

In real usage, the exact choice can depend on region, station terminology, and context. In a train-station sentence like this, перрон is perfectly natural.

A learner should mainly understand that перрон here means the place where you go to board the train.

Нам идти is a common Russian structure meaning something like:

• for us to go
• we should go
• we are supposed to go

In indirect questions, Russian often uses dative + infinitive:

• мне что делать? = what should I do?
• нам куда идти? = where should we go?
• к какому перрону нам идти = which platform we should go to

So нам is in the dative case, and идти stays in the infinitive.

If you said мы идём, that would mean we are going, which is a different idea. Here the issue is not what they are already doing, but where they are supposed to go.

Because Russian often uses the dative + infinitive construction to express what someone is to do, should do, or has to do in a given situation.

So:

• мне идти? = should I go? / am I to go?
• тебе что сказать? = what should you say?
• нам идти = for us to go / we should go

This structure is very common and often feels more natural in Russian than a direct equivalent with a finite verb.

Because the focus is on the process/direction of going, not on the single moment of setting off.

• идти is imperfective
• пойти is perfective

In a question like к какому перрону нам идти, Russian naturally uses идти because it means which platform we should go toward / head to.

If you used пойти, it would shift the nuance toward set off/go off once, which is less natural here.

This is a common pattern:

• Куда мне идти? = Where should I go?
• Что нам делать? = What should we do?

Russian often prefers the imperfective infinitive in these general what am I supposed to do? situations.

This is a very common construction:

• попросить кого-то сделать что-то = to ask someone to do something

So here:

• попросила = asked
• подругу = (her) friend, in the accusative case
• подсказать = to tell/suggest/prompt

Together:

• попросила подругу подсказать = asked her friend to tell her / helpfully point it out

The person being asked goes in the accusative:

• Я попросил брата помочь. = I asked my brother to help.
• Она попросила подругу подсказать. = She asked her friend to tell her / give her a hint.

Because подруга is the direct object of попросила.

She asked whom? Her friend.

So you need the accusative case:

• подруга → подругу

Compare:

• Я вижу подругу. = I see my friend.
• Я попросила подругу помочь. = I asked my friend to help.

If you used подруге, that would be dative and would not fit this verb in this construction.

Not exactly.

• сказать = to say, to tell
• подсказать = to prompt, give a hint, tell someone the needed information, helpfully point something out

In this sentence, подсказать has the sense of giving the needed answer briefly:

• telling her which platform they need

It often implies helpful, practical guidance.

For example:

• Подскажи, как пройти к вокзалу. = Could you tell me / point out how to get to the station?
• Она подсказала ответ. = She prompted the answer.

So here it is more natural than plain сказать, because the friend is helping her with the needed information.

Because the speaker is referring to a single completed act of giving the needed information.

• подсказывать = imperfective, to be prompting / to give hints repeatedly
• подсказать = perfective, to give the needed hint/information once

After попросила, the perfective infinitive is very natural if the speaker means one completed helpful response:

• попросила подсказать = asked her to tell her / point it out

If the context emphasized an ongoing or repeated process, imperfective might appear, but here perfective is the normal choice.

Because they express different kinds of actions.

The perfective verbs show single completed events:

• не расслышала = failed to catch it on that occasion
• попросила = asked once
• подсказать = to give the needed information once

But идти is imperfective because it refers to the general action/direction of going:

• к какому перрону нам идти = which platform we should go to

So the sentence mixes aspects in a very normal way:

• completed actions in the main storyline → perfective
• general action in an indirect question → imperfective

Because the subject is understood to be the same.

The sentence says:

• я снова не расслышала ... и попросила ...

Both verbs refer to the same subject: я.

Russian often omits repeated subjects when they are obvious, just as English often does:

• I didn’t catch it and asked my friend to help.

You could repeat я, but it would usually sound unnecessary unless you wanted emphasis.

Yes. Russian word order is flexible, though some versions sound more neutral than others.

The given sentence is very natural:

• Из-за шума в переходе я снова не расслышала, к какому перрону нам идти, и попросила подругу подсказать.

You could rearrange parts for emphasis, for example:

• Я снова не расслышала из-за шума в переходе, к какому перрону нам идти...

But the original order is good because it sets the scene first:

• Because of the noise in the passageway...

That is a common Russian way to structure a sentence: start with the reason or context, then give the main action.

Yes. It is an indirect question introduced by к какому = to which.

Russian often uses question words inside subordinate clauses after verbs like:

• знать = to know
• понимать = to understand
• слышать / расслышать = to hear / catch clearly
• спросить = to ask

Examples:

• Я не знаю, куда идти. = I don’t know where to go.
• Она не поняла, что он сказал. = She didn’t understand what he said.
• Я не расслышала, к какому перрону нам идти. = I didn’t catch which platform we should go to.

So yes, grammatically it works like an embedded question.

A fairly literal breakdown would be:

• попросила = asked
• подругу = (her) friend
• подсказать = to prompt / to tell helpfully

So literally:

• asked [her] friend to tell/helpfully point out

In natural English, that usually becomes something like:

• asked my friend to tell me
• asked my friend to point it out
• asked my friend which platform we should go to

Russian often leaves some information implied if the context already makes it clear. Here, what the friend is supposed to say is understood from the previous clause.