Two pipes A and B can fill a tank in 24 and 32 min, respectively. If both the pipes are opened together, after how much time pipe B should be closed so that the tank is full in 9 min?

40 min
30 min
10 min
20 min

Correct Answer: 20 min

Explanation:

Here, A = 24 min, B = 32, T = 9 min
∴ Required time = B(1 - T/A )
= 32 ( 1 - 9/24 )
= 32 x 15/24 = 20 min.

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