How do you answer cuando camina a la biblioteca in Spanish?

Answer 1

That doesn't look like a question written in proper spanish. The word-for-word translation of those words is something like "When walk to the library?" however I don't believe that caminar (to walk) is properly conjugated for the question that you asked. If the question is in fact basically "When are you walking to the library?" then you could simply answer with a time, such as "A las dos" if you were going to walk to the library at 2:00 pm.

Source: I took 3 years of High School spanish 15 years ago... LOL

Actually...."camina" is the conjugated form of caminar. It is the third person singular. So the sentence reads "When you walk to the library." As a question, "¿Cuando camina a la biblioteca?" Would be "When do you walk to the library?". You might use the term "usted" after camina to aleviate confusion or to be somewhat more polite.