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SSC Multi Tasking Model Paper 5

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Question : 34

Total: 148

A pipe can fill a tank in 12 minutes and an other pipe in 15 minutes, but a third pipe can empty it in 5 minutes. The first two pipes are kept opened for 4 minutes in the beginning and then the third pipe is also opened. In what time will the cistern emptied?

25 min
20 min
35 min
55 min

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