Question 60

Six pipes are fitted to a water tank. Some of these are inlet pipes and the others outlet pipes. Each inlet pipe can fill the tank in 9 h and each outlet pipe can empty the tank in 6 h. On opening all the pipes, an empty tank is filled in 9 h. The number of inlet pipes is

Solution

Let there are x inlet pipes.

work done by inlet =1/9

work done by outlet=1/6

Here 6-x is the outlets

x/9-(6-x)/6=1/9

5x=20

x=4

Then there will be 4 inlet pipes the will to fill the tank

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