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

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1.	Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively. If tap A remains open all the time and B and C are opened alternately for one hour each, then in how much time will the tank be filled?
A.	2 hours
B.	21 hours
C.	7 hours
D.	9 hours
Answer» D. 9 hours

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