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Arithmetic Ability
Pipes and Cistern

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Q.

A large tanker can be filled by two pipes A and B in 60 and 40 minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill it together for the other half ?

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Correct choice: D

Explanation:

Part filled by (A + B) in 1 minute = (1/60 + 1/40) = 1/24 Suppose the tank is filled in x minutes. Then, x/2(1/24 + 1/40) = 1 (x/2) * (1/15) = 1 => x = 30 min.
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