Two pipes can fill a tank in 20 minutes and 30 minutes respectively. If both the pipes are opened simultaneously, then the tank will be filled up in​

Answers (1)

First pipe can fill a tank in = 20 minutes

In one minute it can fill = 1/20 th of the tank

 Second pipe can fill a tank in = 30 minutes

In one minute it can fill = 1/30 th of the tank

Both together can fill = 1/20 + 1/30 = 5/60 = 1/12 th of the tank in one minute

Hence both pipe together will take 12 minutes to fill the tank completely.

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