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.Management Sciences
Category: Pipes and Cisterns
Two pipes P and Q can fill a cistern in 12 and 15 minutes respectively. Both are opened together, but at the end of 3 minutes the first is turned off. How much longer will the cistern take to fill?
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A. 9 1/4 min
B. 11 1/4 min
C. 7 1/4 min
D. 8 1/2 min
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Pipe A can fill a tank in 6 hours. Due to a leak at the bottom, it takes 9 hours for the pipe A to fill the tank. In what time can the leak alone empty the full tank?
A. 16 hours
B. 15 hours
C. 18 hours
D. 17 hours
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