Three taps A,B and C can fill a tank in 12,15 and 20 hours respectively. If A is open all the time and B ,C are open for one hour each alternatively, the tank will be full in:

Three taps A,B and C can fill a tank in 12,15 and 20 hours respectivel

1.	Three taps A,B and C can fill a tank in 12,15 and 20 hours respectively. If A is open all the time and B ,C are open for one hour each alternatively, the tank will be full in:
A.	6 hrs
B.	20/3 hrs
C.	7 hrs
D.	15/2 hrs
Answer» D. 15/2 hrs

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Three taps A,B and C can fill a tank in 12,15 and 20 hours respectively. If A is open all the time and B ,C are open for one hour each alternatively, the tank will be full in:

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