if three pipes P, Q and R can empty full tank in 25 minutes, if P is twice as efficient as Q and Q is twice as efficient as R then in how much time R will empty 60% of the tank?
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Step-by-step explanation:
Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in:
A.
4
1
2
hours B.
1
13
17
hours
C.
3
9
17
hours D.
2
8
11
hours
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2. Two pipes A and B can fill a cistern in
37
1
2
minutes and
45
minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if pipe B is turned off after
A. 5 min B. 9 min
C. 15 min D. 10 min
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3. A pump can fill a tank with water in 2 hours. Because of a leak, it took
2
2
3
hours to fill the tank. The leak can drain all the water of the tank in
A. 9 hours B. 8 hours
C. 10 hours D. 6 hours
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