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

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Question 1023173: one pipe can fill a tank in 20 minutes , while another takes 30 minutes to fill the same tank.how long would it take two pipes together to fill the tank?
Answer by ikleyn(52803) About Me  (Show Source):
You can put this solution on YOUR website!
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one pipe can fill a tank in 20 minutes , while another takes 30 minutes to fill the same tank.how long would it take two pipes together to fill the tank?
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One pipe fills 1%2F20 of the tank volume per minute.

The second pipe fills 1%2F30 of the tank volume per minute.

Working together, both pipes fill

1%2F20+%2B+1%2F30 = 3%2F60+%2B+2%2F60 = 5%2F60 = 1%2F12

of the tank volume per minute.

Hence it will take 12 minutes to fill the tank if both pipes work simultaneously.

It is a typical problem on joint work.
See the lesson Using fractions to solve word problems on joint work in this site, where you will find
numerous examples of solved problems of this kind.

Read it attentively, and you will learn on how to solve any problem of this kind :)