Math
posted by Bell .
Lunch and Piano Practice: 11:15 a.m. until 12:50 p.m.
What is the elapsed time?
Explanation why your answer is correct:

I'll be glad to check your answer.
http://www.brainpop.com/math/numbersandoperations/elapsedtime/preview.weml 
What is the elapsed time? 1 hour and 35 min.
Explanation why your answer is correct: ? 
Your answer is correct. How did you get it?

I subtracted 12 and 11, also i subtracted 50 and 15. And gave me the elapsed time of 1 hour and 45 minutes.

:)