SOLUTION: A small pipe can fill an oil tank in 6 min more time than it takes a larger pipe to fill the same tank. Working together both pipes can fill a tank in 4 min. How long would it take

Question 437413: A small pipe can fill an oil tank in 6 min more time than it takes a larger pipe to fill the same tank. Working together both pipes can fill a tank in 4 min. How long would it take each pipe working alone to fill the tank?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = time for larger pipe to fill oil tank
given:
= time for smaller pipe to fill tank
---------
Add their rates of filling to get rate working together

Multiply both sides by

The solutions are
(can't use negative time)

and

The smaller pipe takes 12 min
The larger pipe takes 6 min
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