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Arithmetic Ability
Pipes and Cistern

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Q.

A water tank is two-fifth full.Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes.If both the pipes are open,how long will it take to empty or fill the tank completely?

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Correct choice: A

Explanation:

Clearly,pipe B is faster than pipe A and so,the tank will be emptied. part to be emptied = 2/5 part emptied by (A+B) in 1 minute= ( 1 6 − 1 10 )= 1 15 16-110=115 1 15 : 2 5 ::1:x 115:25::1:x 2 5 *15=6mins 25*15=6mins  so, the tank will be emptied in 6 min
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