Terry has completed 15 homework problems, and Susan has completed 9. Terry is completing 10 problems per hour, and Susan is completing 12 per hour. After how many hours will Terry and susan have completed the same number of problems?

Question

anonymous · Answer

3hours
4hours
5hours 
10hours

anonymous · Answer

5 hours I believe, let me double-check my work.

anonymous · Answer

Made a mistake actually, it's 4 hours. @Youth

anonymous · Answer

(1 hour) Terry = 15 Susan = 9
( 2 hours) Terry = 25 Susan = 21
(3 hours) Terry = 35 Susan = 33
(4 hours) Terry = 45 Susan = 45