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

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

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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) (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

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