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 hoursCorrect Answer

D. 7 1/2 hours

Correct Option: C. 7 hours

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