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Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank ?
A. 12 min
B. 15 min
C. 25 min
D. 50 min

Read Solution (Total 1)

ans: 12min

Part filled by A in 1 min = 1/20
Part filled by B in 1 min = 1/30

Part filled by (A + B) in 1 min =(1/20 + 1/30) = 1/12

so Both pipes can fill the tank in 12 minutes.
12 years agoHelpfull: Yes(2) No(0)

GENPACT Other Question

Two taps A and B can fill a tank in 5 hours and 20 hours respectively. If both the taps are open then due to a leakage, it took 30 minutes more to fill the tank. If the tank is full, how long will it take for the leakage alone to empty the tank ?
A. 8 hrs
B. 9 hrs
C. 18 hrs
D. 36 hrs 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. 1×13/17 hours
B. 2×8/11 hours
C. 3×9/17 hours
D. 4×1/2 hours