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TWo pipes can fill a tank in 10 h and 16...

TWo pipes can fill a tank in 10 h and 16 h, respectively. A third pipe can empty the tank in 32 h. If all the three pipes function simultaneously, then in how much time (in h) the tank will be full?

A

`7frac(11)(21)`

B

`7frac(13)(21)`

C

`8frac(4)(21)`

D

`6frac(5)(14)`

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