Question
Use a rational equation to solve. Each exercise is a problem involving work.A faucet can fill a sink in 5 minutes. It takes twice as long for the drain to empty the sink. How long will it take to fill the sink if the drain is open and the faucet is on?
Step 1
We know that $F$ can fill the sink in 5 minutes, so $F = \frac{1}{5}$ sink per minute. We also know that $D$ takes twice as long to empty the sink, so $D = \frac{1}{2F} = \frac{1}{10}$ sink per minute. Show more…
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