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By Mathematics Mcqs Pipes and Cisterns No Comments

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 hours
D. 7 1/2 hours

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