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A,B and C are three taps connected to a ...

A,B and C are three taps connected to a tank. A and B together can fill the tank in 6 h, B and C together can fill it in 10 h and A and C together can fill it in `7(1/2) h . In how much time,all three would take to fill the tank?

A

10 h

B

12 h

C

20 h

D

5 h

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