SOLUTION: Frank can type a report in 4hours and James takes 5hrs how long will it take the two of them typing togwther
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Question 402747: Frank can type a report in 4hours and James takes 5hrs how long will it take the two of them typing togwther Answer by nerdybill(7384) (Show Source):
You can put this solution on YOUR website! Let x = time (hours) it takes working together
then
x(1/4 + 1/5) = 1
multiplying both sides by 20:
x(5 + 4) = 20
9x = 20
x = 2.22 hours
or
x = 2 hours and 13 minutes
