SOLUTION: Tom swims one lap every 5 minutes. Rob swims one lap every 4 minutes. If they start together, in how many minutes will they start a lap together again? A. 9 B. 10 C. 20 D. 40

Algebra ->  Average -> SOLUTION: Tom swims one lap every 5 minutes. Rob swims one lap every 4 minutes. If they start together, in how many minutes will they start a lap together again? A. 9 B. 10 C. 20 D. 40      Log On


   

Question 817910: Tom swims one lap every 5 minutes. Rob swims one lap every 4 minutes. If they start together, in how many minutes will they start a lap together again?
A. 9
B. 10
C. 20
D. 40
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
in twenty minutes Tom will start his 5 th lap after finishing his 4th 4*5
in twenty minutes Rob will start his 6 th lap after finishing his 5th 5*4