
Merrissa N. answered 11/17/15
Tutor
New to Wyzant
Certified Chemistry Teacher
You can start by figuring our the amount of hours he was gone first. Since 9:40am is closer to 10:00am I am going to start counting there.
10:00am - 11:00am is 1 hour
11:00am - 12:00pm is 2 hours.
We are now close to our answer. Lets look at minutes now.
9:40am - 10:00am is 20 minutes
and
12:00pm - 12:15pm is 15 minutes
Add the minutes and hours together
2 hours + 20 minutes + 15 minutes = 2 hours and 35 minutes