SOLUTION: With both hot and cold water running, a bathtub can be filled in 8 min. The drain will empty the tub in 10 min. A child turns both faucets on and leaves the drain open. How long wi
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-> SOLUTION: With both hot and cold water running, a bathtub can be filled in 8 min. The drain will empty the tub in 10 min. A child turns both faucets on and leaves the drain open. How long wi
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Question 908930: With both hot and cold water running, a bathtub can be filled in 8 min. The drain will empty the tub in 10 min. A child turns both faucets on and leaves the drain open. How long will it be until the bathtub starts to overflow? Answer by richwmiller(17219) (Show Source):
You can put this solution on YOUR website! 1/a+1/b=1/x
1/8+1/-10=1/x
-10/-80+8/-80=1/x
-2/-80=1/x
x=-80/-2
x=40 minutes working together
check
x/a+x/b=1
x/8+x/-10=1
40/8+40/-10=1
5+-4=1
1=1
ok