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1)

Two pipes A and B can fill a tank separately in 10 min and 20 min respectively. If both the pipes are used together, how much time will be taken to fill the tank?

2)

A cistern can be filledup in 14 hours by an inlet M. Another outlet N can empty the cistern in 18 hours. If both the inlets M and N are opened together, then after how long will the cistern be fully filled?

3)

A pipe can fill a tank in 20 hours. Due to a leak in the bottom, it is filled in 40 hours. If the tank is full, how much time will the leak take to empty it?

4)

Two pipes A and B can fill a tank in 12 and 16 min respectively. If both the pipes are opened together, then calculate the time after which B should be closed, so that the tank is full in 9 minutes.

5)

If two pipes A and B can fill a tank in *t* min. If time taken by A alone is 4 minutes more than *t* and time taken by B alone is 25 minutes more than *t*, then the time taken by both the pipes together is?

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