Math
posted by Bell .
Time with friends: 4:05 p.m. until 5:45 p.m.
What is the elapsed time?
Explanation why your answer is correct:

Please learn to tell time.
I'll be glad to check your answer. 
What is the elapsed time? 1 Hour and 40 Minutes.
Explanation why your answer is correct: ? 
Right.

I subtracted 12 hours  4 hours = 8 hours. I also subtracted 50 minutes  5 minutes = 45 minutes. And gave me the elapsed time of 8 hours and 45 minutes.