SOLUTION: A pipe can fill a tank in 12 hours. Another pipe can do the same job in 6 hours. How long will it take them if they work together?

Question 935223: A pipe can fill a tank in 12 hours. Another pipe can do
the same job in 6 hours. How long will it take them if they work together?
Answer by josgarithmetic(39799) (Show Source): You can put this solution on YOUR website!
Fill a Tank, uniform rates problem.
RT=J, for rate, time, job. One tank filled is one job.
Sum of the individual rates is the combined rate for all agents working simultaneously.

, TANKSperHOUR; which means 4 hours to fill the tank.
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