Question

A tank has two inlets which can fill it in 6 and 9 hours respectively. It has developed a leak because of which
RAD
GA
a
it takes 4 hours for the tank to be filled. If the tank is full and the inlets are closed, how long will it take for
the tank to get emptied?
60​

Answer 1

Answer:

2

Step-by-step explanation:

step by step is followed

Answer 2

Lets calculate contribution of each inlet to fill the cistern,

we will use negative contribution for inlet emptying the cistern.

Let total volume of cylinder be 1 unit.

A's one minute contribution=

12

1

B's one minute contribution=

15

1

C's one minute contribution=−

10

1

(A+B+C)'s one minute contribution in filling the tank=

12

1

+

15

1

−

10

1

=

60

(5+4−6)

=

20

1

Time taken by A+B+C to fill 1 unit of volume=

1/20

1

min=20min