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Pipe A can fill a tank in 10 hours, P...

Pipe A can fill a tank in 10 hours, Pipe B can fill the same tank in 15 hours. Pipe C can empty the full tank in 20 hours. Pipes A, B and C are opened alternatively for one hours each. If A is opened first, then how many hours will they take to till the empty tank? `24\ h r s` b. `25\ h r s` c. `26\ h r s` d. `24 2/3h r s`

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RS AGGARWAL-PIPES AND CISTERNS-All Questions
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  14. Water flows through a cylindrical pipe of internal diameter 7 cm at...

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  15. An outlet pipe can empty a cistern in 3 hours. In what time will th...

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  16. Two pipes A and B can fill a tank in 24h and 30 h respectively. If ...

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  17. A tank is 7 metre long and 4 metre wide. At what and speed should w...

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  18. Two pieces A and B can fill a tank in 18 hrs and 6 hrs respectively...

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  19. Two pipes can fill a tank in 12 hours and 16 hours respectively. A ...

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  20. a tank has two outlets A and B, which together take 6h to empty a f...

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