Question

an inlet pipe can fill a water tank in 10 hours while an outlet pipe can empty the same tank in 15 hour. by mistake both pipe let open. how long it will take to fill the tank.

Answer 1

Answer:

Time taken to fill the tank when both the taps open be xhrs

In 1hour the tank is filled when both the taps open=1/x

In 10hrs the tank is filled.

So, in 1hr the tank filled=1/10

In 15hrs the tank is emptied.

So, in 1hr the tank emptied=1/15

A.T.Q

1/X = 1/10 - 1/15

= (3-2)/30

=1/30

So x=30hrs