Question

pipe A fill a cistern in 12 hours and pine B empties it in 15 hours. both pies are opened in how much time the cistern would filled up​
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Answer 1

Answer:

correct answer is 20 hours

Step-by-step explanation:

Pipe A can fill in 12 hrs.

Pipe B can fill in 15 hrs.

Pipe C can empty in 10 hrs.

In one hour, the pipe A can fill 112 part

In one hour, the pipe B can fill. 115 part.

In one hour, the pipe C can empty 110 part.

If all the three open together A B C can fill (112+115−110) part

= 5+4−660=360=120 part

The tank can be filled in 20 hours

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