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
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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) (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
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