SOLUTION: A sink has two faucets: one for hot water and one for cold water. The sink can be filled by a cold water faucet in 3.9 minutes. If both faucets are open, the sink is filled in 3 mi

Question 968661: A sink has two faucets: one for hot water and one for cold water. The sink can be filled by a cold water faucet in 3.9 minutes. If both faucets are open, the sink is filled in 3 minutes. How long does it take to fill the sink with just the hot water faucet open?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add their rates of filling to get rate
of filling together
Let = time in minutes for
the hot water faucet to fill sink
-----------------------------
Rate for hot water faucet:
[ 1 sink filled ] / [ t min ]
Rate for cold water faucet:
[ 1 sink filled ] / [ 3.9 min ]
--------------------------

Multiply both sides by

It takes 13 minutes for
the hot water faucet to fill sink
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