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A water tap fills a tub in 'p' hours and...

A water tap fills a tub in 'p' hours and a sink at the bottom empties it in 'q' hours. If `p lt q` and both tap and sink are open, the tank is filled in 'r' hours, then

A

`1/r=1/p+1/q`

B

`1/r=1/p-1/q`

C

`r=p+q`

D

`r=p-q`

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CHAMPION PUBLICATION-2016 TIER-II PAPER(15)-EXERCISE
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