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Two taps can separately fill a cistern i...

Two taps can separately fill a cistern in 10 minutes and 15 minutes respectively and when the waste pipe is opened , they can together fill it in 18 minutes . The waste pipe can empty the full cistern in

A

7 minutes

B

9 minutes

C

13 minutes

D

23 minutes

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Verified by Experts

The correct Answer is:
B
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UPKAR PUBLICATION -PIPES AND CISTERNS-QUESTION BANK
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  2. A cistern has two taps which fill it in 12 minutes and 15 mintues resp...

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  3. Two taps can separately fill a cistern in 10 minutes and 15 minutes re...

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  4. A tap can fill a tank in 16 minutes and another can empty it in 8 minu...

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  5. A tank is filled by a pipe A in 32 minutes and pipe B in 36 minutes,Wh...

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  6. A cistem can be filled by two pipes A and B 4 hours and 6 hours respe...

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  7. One tap can fill a cistern in 2 hours and another can other can empty ...

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  8. A pipe can fill a tank in x hours and another can empty it in y hours....

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  9. A tap can fill a cistern in 8 hours and another can empty it in 16 hou...

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  10. Two taps A and B can fill a tank in 10 hours and 15 hours, respectivel...

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  11. A cistern has a leak which would empty it in 8 hours. A tap is turned ...

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  12. Three pipes A, B and C can fill a tank in 6 hours. After working at...

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  13. If two pipes function simultaneously, a reservoir will be filled in...

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  14. Two pipes A and B can fill a tank in 15 hours and 20 hours respectivel...

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  15. There are two taps to fill a tank while a third to empty it. When the ...

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  16. A pipe can fill a cistern in 12 min and another pipe can fill it in 15...

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  17. A leak in the bottom of a tank can empty the full tank in 6 hours. An ...

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  18. Two pipes X and Y can full a cistern in 24 minutes and 32 minutes resp...

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  19. A cistern is normally filled in 8 h but takes 2 h more to fill because...

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  20. A water tank is 2/5th full. Pipe A can fill the tank in 10 minutes and...

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