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

Question

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:

Options:

A . 6 hours

B . $$6\frac{2}{3}$$ hours

C . 7 hours

D . $$7\frac{1}{2}$$ hours

Answer: Option C

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