Question

11. Pipe A can fill a tank in 8 hours and pipe B can fill it in 12 hours. Both the pipes are opened but
after three hours pipe B is closed. How much time will it take pipe A to fill the remaining part
of the tank?​

Answer 1

Answer:

3 hours

Step-by-step explanation:

pipe A can do the work in 1 hour=1/8

pipe B can do the work in 1 hour=1/12

as they are doing the work together si we will add their work done in 1 hour.

1/8+1/12=5/24

this much work is done in 1 hour

in 3 hours 15/24 work is done.

the work which is left is 9/24

so we will divide it by 1/8.

9/24÷1/8=9/24*8

=3

hope it helps......

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