Question

Pipes ‘M’ and ‘N’ alone can fill a tank in 14 minutes and 21 minutes, respectively, while pipe ‘O’ can empty the same tank in 42 minutes. If all three pipes are opened together, then find the time taken to fill the tank.

Q: Answer-Pipes ‘M’ and ‘N’ alone can fill a tank in 14 minutes and 21 minutes, respectively, while pipe ‘O’ c...

ATQ,Let the capacity of the tank be 84 litres LCM 14, 21, and 42 Efficiency of pipe M 8414 6 litresminute Efficiency of pipe N 8421 4 litresminute Efficiency of pipe O 8442 2 litresminute Required time 84 6 4 2 12 minutes

A 4 mins

B 9 mins

C 12 mins

D 10 mins

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Pipes ‘M’ and ‘N’ alone can fill a tank in 14 minutes and 21 minutes, respectively, while pipe ‘O’ can empty the same tank in 42 minutes. If all three pipes are opened together, then find the time taken to fill the tank.

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