SOLUTION: A pump can fill an oil tank in 18 hours. Beginning with an empty tank, the pump and a second pump fill three-fifths of the tank in 6 hours. If the first pump is then shut off, how

Question 1108048: A pump can fill an oil tank in 18 hours. Beginning with an empty tank, the pump and a second pump fill three-fifths of the tank in 6 hours. If the first pump is then shut off, how long will it take the second pump to finish filling the tank?
Answer by josgarithmetic(39616) (Show Source): You can put this solution on YOUR website!
Pump 1
18 hours to fill 1 tank

Pump 1 plus Pump 2
6 hours to fill tank

Pump 2
x unknown hours to fill 1 tank

------solve to find the time for just pump #2 to fill 1 tank-ful by itself.

, LCD is 180x,...
.
.
-------hours for pump #2 to fill 1 tank.

The question means, how much time for pump #2, to fill of the tank.
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