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Three pipes A, B and C are attached t...

Three pipes A, B and C are attached to a tank. A and B can fill  it in 20 and 30 minutes respectively while C can empty it in 15 minutes. If A, B and C are kept open successively for 1 minute each how soon will the tank be filled?

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RS AGGARWAL-PIPES AND CISTERNS-All Questions
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  14. Pipes A and B can fill a tank in 20 hours and 30 hours respectively...

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  15. A pipe can fill a tank in 3 hours. There are two outlet pipes from ...

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  16. In what time would a cistern be filled by three pipes whose diamete...

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  17. A tap can fill a tank in 6 hours. After half the tank is filled, th...

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  18. A cistern has two pipes. One can till it with water in 8 hours and ...

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  19. A vessel has three pipes connected to it two to supply liquid and o...

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  20. Two pipes A and B can separately fill a cistern in 60 minutes and 7...

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