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 is_______?

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

C. 7 hrs
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