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Pipes and Cisterns

Pipes and Cisterns

Two pipes A and B can separately fill a tank in 2 minutes and 15 minutes respectively. Both the pipes are opened together but 4 minutes after the start the pipe A is turned off. How much time will it take to fill the tank?

A. 9 min
B. 10 min
C. 11 min
D. 12 min

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Two pipes A and B can fill a cistern in 20 and 30 minutes respectively, and a third pipe C can empty it in 40 minutes. How long will it take to fill the cistern if all the three are opened at the same time?

A. 19 1/7 min
B. 15 1/7 min
C. 17 1/7 min
D. 7 1/7 min

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