Chain Rule Practice Test 2 with solutions

Question : 3 of 40

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12 pumps working 6 hours a day can empty a completely filled reservoir in 15 days. How many such pumps working 9 hours a day will empty the same reservoir in 12 days?

Validate

Solution:

Hours	Days	Pumps
6	15	12
9	21	x

⇒

x/{12}

{15}/{12} 6/9

∴ x =

{15}/{12} × 6/9 × 12

= 10 days

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