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HCU MCA 2015 Paper

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Question : 19

Total: 75

Three pipes fill a tank separately ;in 10 hours, 20 hours and 30 hours respectively. An outlet pipe can empty it in 15 hours when no water flows in. If all the pipes are opened, when the tank is empty, then how long, in hours, will it take to fill the tank ?

64
7
60
7
15
2
20
3

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