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 _____ ?

– by 0

A. 7 hours
B. 7 1/2 hours
C.  6 hours
D. 6 2/3 hours

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