Asked by June

Mr. Bailey mowed his yard in 90 minutes. His son Roy mows the yard in 75 minutes. How long will it take them if they work together (using 2 lawn mowers)?
How to set up an equation? Thank you.
Answered by Damon
B does 1/90 yards/min
R does 1/75 yards/min

B+R together do (1/90 + 1/75)yards per minute

1/90 + 1/75 = .0244 yards/min
1/.0244 = 40.9 minutes/yard
Answered by June

Thank you so much!
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