Question

A and B are two taps which can fill in cistern in 30 hours and 45 hours respectively outlet C can empty a full cistern in 60 hours . A and B are opened when the cistern was empty. after 12 hours C is also opened . after how long the cisternwill be full ​

Answer 1

Answer:

In one minute the pipe of 2cm diameter fills 1/61 of the cistern. In one minute (1/61+1/(61*4)+4/(61*9))=1/36 of the cistern is filled. The whole cistern is filled in 36 minutes.

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