If the chicken crossed the road at 3 pm and again at 5 pm, how many hours were there between crossings?

It would be 2 hours .

3pm . 4pm , 5pm

Unless it was another day so if you could be a bit more precise it would be better.

2 hours have passed between the crossings. :) Have a goodnight. 

Was it on the same day? Otherwise it might be unknown