SOLUTION: Working alone, Carlos can oil the lanes in a bowling alley in five hours. Jenny can oil the same lanes in nine hours. If they work together how long would it take them?

Question 950091: Working alone, Carlos can oil the lanes in a bowling alley in five hours. Jenny can oil the same lanes in nine hours. If they work together how long would it take them?
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
Carlos oils all lanes/5 hrs= 1/5 of the lanes/hr.
Jenny oils all lanes/9 hrs=1/9 lanes per hour.
Together they oil 1/5 per hr+1/9 per hr=9/45 per hr+ 5/45 per hr=14/45 lanes per hr=0.311=31.1% of all lanes per hour
To do all lanes 1/0.311=3.21 hrs ANSWER: Together it takes Carlos and Jenny 3.21 hours to oil all the lanes.
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