SOLUTION: One computer can process the payroll for a company in 5hours. A new computer can process it in 3 hours. Which equation could be used to find how long it will take to process the pa

Question 697540: One computer can process the payroll for a company in 5hours. A new computer can process it in 3 hours. Which equation could be used to find how long it will take to process the payroll if both computers are used.
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
One computer can process the payroll for a company in 5hours. A new computer can process it in 3 hours. Which equation could be used to find how long it will take to process the payroll if both computers are used.
.
Since you don't provide the options available, the general equation is:
Let x = time (hours) for both
then
x(1/5 + 1/3) = 1
to solve:
multiplying both sides by 15:
x(3 + 5) = 15
x = 15/8
x = 1 hour and 53 minutes
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