SOLUTION: Randy Howard can type a paper in 30 minutes. His sister candy can type the same paper in 45 minutes. How many minutes will it take them if they type the paper together?

Question 413586: Randy Howard can type a paper in 30 minutes. His sister candy can type the same paper in 45 minutes. How many minutes will it take them if they type the paper together?
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
Randy Howard can type a paper in 30 minutes. His sister candy can type the same paper in 45 minutes. How many minutes will it take them if they type the paper together?
.
Let x = time (minutes) it takes for both
then
x(1/30 + 1/45) = 1
multiplying both sides by 90:
x(3 + 2) = 90
5x = 90
x = 18 minutes

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