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A pipe can fill a tank in 15 minutes and...

A pipe can fill a tank in 15 minutes and another one in 10 minutes. A third pipe can empty the tank in 5 minutes. The first two pipes are kept open for 4 minutes in the beginning and then the third pipe is also opened. In what time will the tank be emptied ?

A

35 min

B

15 min

C

20 min

D

Cannot be emptied

Text Solution

Verified by Experts

The correct Answer is:
C
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DISHA PUBLICATION-TIME AND WORK-Practice Exercise (Standard Level)
  1. A pipe can fill a tank in 15 minutes and another one in 10 minutes. A ...

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  2. Filling pipe, if opened alone, takes 5 minutes to fill a cistern. Sudd...

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  3. Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectiv...

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  4. 1 man or 2 women or 3 boys can do a work in 44 days. Then, in how many...

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  5. A, B and C can do a work in 8, 16 and 24 days respectively. They all b...

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

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  7. A contractor undertook to do a piece of work in 9 days. He employed ce...

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  8. After working for 8 days, Anil finds that only 1/3 of the work has bee...

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  9. A can build up a wall in 8 days while B can break it in 3 days. A has ...

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  10. A cistern has two taps which fill it in 12 minutes and 15 minutes resp...

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  11. A and B together can do a piece of work in 12 days which B and C toget...

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  12. A pump can be operated both for filling a tank and for emptying it. Th...

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  13. A tank is filled in 5 hours by three pipes A, B and C. The pipe C is t...

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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. 4 men and 6 women finish a job in 8 days, while 3 men and 7 women fini...

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  16. A can do a work in 25 days and B can do the same work in 20 days. They...

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  17. One man can do as much work in one day as a woman can do in 2 days. A ...

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  18. There is leak in the bottom of a tank. This leak can empty a full tank...

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  19. A company has a job to prepare certain no. of cans and there are three...

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  20. 3 small pumps and a large pump are filling a tank. Each of the three s...

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