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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?
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- 40 min
- 30 min
- 10 min
- 20 min
Correct Option: D
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.
