Problema Solution
It takes Mr. Rose 10 hours to complete a printing job. His helper John can complete the same job in 15 hours. If Mr. Rose and John work together, how long will it take them to complete the job?
Answer provided by our tutors
Let 'x' represent the number of hours that Mr.Roe and John need to finish the job together.
The rate of Mr.Rose is: 1/10 job per hour
The rate of John is: 1/15 job per hour
The together rate is: 1/x job per hour
1/10 + 1/15 = 1/x
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click here to see the equation solved for x
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x = 6 hr
They will need 6 hours to complete the job together.