SOLUTION: A tank can be filled by hose in 10 hours. A tank can be emptied by drain pipe in 20 hours . If drain is left opened while filling how long will it take to fill? x=20 hours

Algebra ->  Rate-of-work-word-problems -> SOLUTION: A tank can be filled by hose in 10 hours. A tank can be emptied by drain pipe in 20 hours . If drain is left opened while filling how long will it take to fill? x=20 hours      Log On


   

Question 821904: A tank can be filled by hose in 10 hours. A tank can be emptied by drain pipe in 20 hours . If drain is left opened while filling how long will it take to fill?

x=20 hours.
Is this right?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
x/10-x/20=1
x=20
or
(1/10)x-(1/20)x= 1
1/10-1/20=1/x
1/20=1/x
check
2-1=1
ok