Pipes&cistern

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Two pipes P and Q fill a tank in 9hrs and 5hrs respectively.If both the pipes are opens together then after how many hours should Q closed so that the tank is full in 6hrs respectively ?

8/3hrs

5/3hrs

5hrs

3/2hrs

Explanation:

Part of the tank is filled in 6hrs = 6/9 = 2/3
Time taken by pipe Q = 5*1/3 = 5/3
Hence, option 2 is the correct answer.

By: Amit Kumar

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