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 and C are open for one hour each alternately, the tank will be full in:

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

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 and C are open for one hour each alternately, the tank will be full in:
A.	6 hours
B.	6(2/3) hours
C.	7 hours
D.	7(1/2) hours
Answer» D. 7(1/2) hours

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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 and C are open for one hour each alternately, the tank will be full in:

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