Question

А cistern has two inlets 'A and B² which
can fill it in 12 hours and 15 hours
respectively. An outlet 'C' can empty the
full cistern in 10 hours if all the 3
pipes are opened
together, how much
time will they take to fill the cistern
completely?​

Answer 1

Answer:

20 hrs.

Step-by-step explanation:

Time taken by A to fill the tank = 12 hrs..

Time taken by B to fill the tank = 15 hrs...

Time taken by C to empty the tank = 10 hrs..

So, in 1 hr, they together will do 1/12 + 1/15 - 1/10 work = 1/20 work.

So it will take 20 hrs to fill the tank......