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6)

Two pipes M and N can fill a tank in 10 and 60 min respectively. If both the pipes are opened together, then calculate the time after which N should be closed, so that the tank is full in 3 minutes.

7)

If three pipes X, Y, Z can fill a cistern separately in 4, 5 and 10 hours respectively, then the time taken by all the three pipes to fill the tank when all pipes are opened together is?

8)

A pipe can fill a tank in 15 hours. another pipe can empty the full tank in 20 hours. If both pipes are opened simultaneously, then what is the time taken to fill the tank?

9)

If three pipes P, Q, R can fill a cistern separately in 8, 6 and 20 hours respectively, then what is the time taken by all the three pipes to fill the tank when all pipes are simultaneously?

10)

A pipe can fill a tank in 45 minutes. another pipe can empty the full tank in 120 minutes. If both pipes are opened simultaneously, then what is the time taken to fill the tank?

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