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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`

Text Solution

Verified by Experts

The correct Answer is:
B
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GAGAN PRATAP -PIPE & CISTERN-MULTIPLE CHOICE QUESTION
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  7. Pipes A and B are emptying pipes and can empty a tank in 6 hours and 1...

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  8. Three pipes, A, B and C, can fill a cistern in 12, 18 and 24 minutes, ...

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  12. Pipes A and B are filling pipes while pipe C is an emptying pipe A and...

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  13. Pipes A, B and C together can fill a cistern in 12 hours. All the thre...

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  14. Pipes A, B and C can fill a tank in 10, 15 and 30 hours, respectively....

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  15. Pipe A and B can fill a tank in 16 hours and 24 hours respectively whe...

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  16. Two pipe A and B can fill a tank with water in 42min and 35min respect...

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  17. Two taps A and B can fill a tank in 48 min. and 36 min. If both taps a...

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  18. Three pipes, A, B, C can fill an empty cistern in 2, 3 and 6 hours res...

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  19. Pipe A can fill a tank in 16 minutes and pipe B emptics it in 24 minut...

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  20. An empty cistern has three pipes A, B and C. A and B can fill it in 45...

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