Question 749732
from pipe a it takes 4 hours to fill the tank.from pipe b it takes 8 hours empty the tank.if the both pipes are opened how many hours to fill the tank?
.
Let x = time (hours) to fill tank w/both pipes open
then
x(1/4 - 1/8) = 1
x(2/8 - 1/8) = 1
x(1/8) = 1
x/8 = 1
multiply both sides by 8:
x = 8 hours