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 o

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Q 1434001852.     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

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