SOLUTION: two printing presses working together can complete a job in 2.5hours.working alone,press A can do the job in 10 hours.How many hours will press B take to do the job by itself

Question 628959: two printing presses working together can complete a job in 2.5hours.working alone,press A can do the job in 10 hours.How many hours will press B take to do the job by itself
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
two printing presses working together can complete a job in 2.5hours.working alone,press A can do the job in 10 hours.How many hours will press B take to do the job by itself
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together rate: 1/(5/2) = 2/5 job/hr
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A machine rate: 1/10 job/hr
B machine rate: 1/x job/hr
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Equation:
rate + rate = together rate
1/x + 1/10 = 2/5
Multiply thru by 10x to get:
10 + x = 4x
3x = 10
x = 3 1/3 hrs (time for the B machine to do the job alone)
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Cheers,
Stan H.
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