Working alone, a small pump takes twice as long as a large pump takes to fill an empty tank...

Source: GMAT Paper Tests

Working alone, a small pump takes twice as long as a large pump takes to fill an empty tank. Working together at their respective constant rates, the pumps can fill the tank in 6 hours. How many hours would it take for the small pump to fill the tank working alone?

A. 8
B. 9
C. 12
D. 15
E. 18

The OA is E

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