Ella halló la respuesta rápidamente.

Halló is the third-person singular preterite form of hallar, so it means he/she found or she discovered.

In this sentence, Ella halló... = She found...

A quick breakdown:

• hallar = to find, to discover
• halló = she found

It refers to one completed action in the past.

That’s right: in Spanish, subject pronouns are often omitted because the verb ending already shows who the subject is.

So:

• Halló la respuesta rápidamente. = perfectly natural
• Ella halló la respuesta rápidamente. = also correct

Using ella can add:

• emphasis
• contrast
• clarity, if it’s important to say she rather than someone else

For example:

• Él no la encontró, pero ella halló la respuesta rápidamente.

So ella is not required, but it can be used for effect.

The preterite is used for a completed action in the past.

Here, the idea is that she found the answer as a finished event. That is why halló is used.

Compare:

• halló = she found it, completed event
• hallaba = she was finding / she used to find, more ongoing or descriptive
• ha hallado = she has found, connected to the present

So Ella halló la respuesta rápidamente presents the finding as a single completed past action.

Hallar is correct and understood, but encontrar is often more common in everyday speech.

So these are very similar:

• Ella halló la respuesta rápidamente.
• Ella encontró la respuesta rápidamente.

Hallar can sound:

• a bit more formal
• a bit more literary
• sometimes more like discover than just physically find

In many everyday situations, learners will hear encontrar more often, but hallar is still a real and useful verb.

Because Spanish usually uses an article with a noun when referring to a specific thing.

Here, la respuesta means the answer — a particular answer.

So:

• la = the
• respuesta = answer

Together:

• la respuesta = the answer

Leaving out the article here would sound unnatural.

Rápidamente is an adverb meaning quickly, and it modifies the verb halló.

Its position is natural here:

• Ella halló la respuesta rápidamente.

This is similar to English She found the answer quickly.

Spanish adverb placement is somewhat flexible. You could also say:

• Ella rápidamente halló la respuesta.
• Ella halló rápidamente la respuesta.

But the original version sounds very natural and neutral. Putting rápidamente at the end often feels smooth and common.

The accent mark in halló shows the stress falls on the last syllable: ha-LLÓ.

It also helps distinguish it from other forms in writing.

For example:

• hallo = I find
• halló = he/she found

So the accent is important both for pronunciation and for showing the correct verb form.

Rápidamente is formed from:

• rápida
  • -mente

When an adverb is made with -mente, the original adjective often keeps its written accent if it had one.

So:

• rápida → rápidamente

That is why the accent stays on the first a.

A simple guide is:

• h is silent
• ll is usually pronounced like a y sound in most of Spain
• the stress is on the last syllable because of the accent mark

So it sounds approximately like:

• a-YÓ

Depending on the region, ll may sound slightly different, but for most learners, thinking of it as a y sound is fine.

Yes, sometimes that works.

Because hallar can mean both:

• to find
• to discover

So depending on context, the sentence could suggest:

• She found the answer quickly
• She discovered the answer quickly

If the context is about solving a problem or working something out, discovered may feel natural. If it is just the general act of finding, found is the most straightforward translation.