Asked by jj

One pipe can fill a tank in 20 minutes, while
another takes 30 minutes to fill the same tank.
How long would it take the two pipes together
to fill the tank?

Answers

Answered by Reiny
rate of first = 1/20
rate of 2nd = 1/30
combined rate = 1/20 +1/30 = 1/12

time to fill at combined rate = 1/(1/12) = 12

It will take 12 minutes.
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