I am a 5 th grader who need some help my mom is blind.

What is the elapsed time:
(1) Between 3:45- 9:00
(2) 6:50-7:00

Between four o'clock and nine o'clock is five hours. Add fifteen minutes to that and get five hours and fifteen minutes.

6 o'clock and 60 minutes would be 7:00
60 - 50 = ten minutes