Q 1424001851.     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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