How would you answer a que hora sales de la escuela in Spanish?

Answer 1

It means 'At what time do you come to the Spanish class?'

You could reply simply with the time:

A la una - At one o'clock

A las dos/tres/cuatro/cinco/seis/siete/ocho/nueve/diez/once/doce - At 2-12 o'clock

Or you could preface one of these with:

Vengo (I come) (e.g....'Vengo a la una')

Answer 2

It means "What time do you get out of school?". Probably something like "Salgo de la escuela a las tres." This means "I leave school at three".