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Teamwork — GMAT Question of the Day

QOD2015_0914
Explanation


To solve this equation, plug Arthur and John's times (using J for John's) and their combined time into the combined work-rate formula: (7J)/(7+J)=5

Multiply out and solve:

7J = 35 + 5J
2J= 35
J=17.5
The correct choice is (D).