school starts at 7:45am and finishes at 2:50pm how long is the school day?

Question

math word problem

Answer 1

Remember grade school subtraction?

 

    PM  2:50

 - AM  7:45

----------------

  xxxxxx:05

 

Can't subtract 7 from 2, so "borrow" 12 hours:

     AM  14:50

     AM    7:45

 ----------------

              7:05

 

7 hours and 5 minutes.

 

Answer 2

Seven hours and five minutes.

note: each hour is 60 minutes!