Asked by SAM

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?
a. 3 hrs**** b. 4 hrs c. 5 hrs d 10 hrs
Answered by Ms. Sue
10, 20, 30, 40, 50, 60, 70, 80
12, 24, 36, 48, 60, 70
Answered by Ms. Sue
Three hours isn't right.

How many hours will it take for each of them to finish 60 problems?

Answered by Bor
It's 4 hours, it's not difficult.
Answered by Bor
Ms Sue, you had it wrong though haha.
It's:
15 9
25 21
35 33
45 45
55
65
75
85
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