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Three pipes can fill a reservoir in 10, ...

Three pipes can fill a reservoir in 10, 15 and 20 hours respectively. If the three taps are opened one after another in the given order, with a certain fixed time gap between them, the reservoir fills in 5 hours. The time gap is `15\ m in` b. `\ 30\ m in` c. `45\ m in` d. `\ 1\ h r`

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RS AGGARWAL-PIPES AND CISTERNS-All Questions
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  13. A town is supplied with water from a big overhead tank which is fed...

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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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