SOLUTION: (Time required to do a job) Two pumps are available for filling a gasoline storage tank. Pump A, used alone, can fill the tank in 3 hours, and pump B, used alone, can fill it in 4

Question 781310: (Time required to do a job) Two pumps are available for filling a gasoline storage tank. Pump A, used alone, can fill the tank in 3 hours, and pump B, used alone, can fill it in 4 hours. If both pumps are used simultaneously, how long will it take to fill the tank?
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
The sum of their rates is the filling rate when both pumps work at the same time.
Pump A, 1/3 tanks per hour
Pump B, 1/4 tanks per hour

Pump A and B Together, tanks per hour

tanks per hour.

The other way to describe this combined rate is HOURS to fill THE TANK.
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