SOLUTION: Left on together, the cold and hot water faucets of a certain bathtub take 6 minutes to fill the tub. If it takes the hot water faucet 15 minutes to fill the tub by itself, how lo

Question 814324: Left on together, the cold and hot water faucets of a certain bathtub take 6 minutes to fill the tub. If it takes the hot water faucet 15 minutes to fill the tub by itself, how long will it take the cold water faucet to fill the tub on its own?
Do not do any rounding.
Found 2 solutions by josgarithmetic, richwmiller:
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
The rates of both faucets open together are additive.
'
where c is the fill rate for the COLD water faucet in tubs per minute. Solve for c, and then find the reciprocal; which would then be in unit of MINUTES per TUB.
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
6/15+6/x=1
6/x=9/15
2/x=3/15
1/x=3/30
1/x=1/10
x=10

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