Learn Turkish: Gözlemciler beşe yirmi kala pistten ayrılacak. - The observers will leave the track at twenty to five.

It uses the formula for stating when an event happens: Hour + Dative case combined with Minutes + kala. Here, beş (five) gets the dative ending -e (to five). Then we add yirmi (twenty) and kala (meaning "remaining", from the verb kalmak). Literally, it translates to "leaving twenty remaining to five".

Why is the word for track pistten instead of just pist or piste?

The verb ayrılmak (to leave / depart) requires the ablative case ("from") because you are separating from somewhere. Pist means "track". We add -ten instead of -den because of consonant harmony: pist ends in a voiceless consonant (t), so the suffix must also start with a voiceless consonant.

The subject Gözlemciler is plural. Why is the verb ayrılacak singular instead of ayrılacaklar?

In Turkish, when the subject is plural and human, adding the plural suffix -lar to the verb is optional. You could say ayrılacaklar, but leaving the verb in the singular form (ayrılacak) is very common, sounds natural, and is completely grammatically correct.

How is the word gözlemciler constructed?