Asked by jj

trey can clean a room in 40 minutes. his brother Marcus can clean the same room in 20 minutes. how long will it take them to clean the room if they work together?

Answers

Answered by Reiny
Trey's rate = 1/40
Marcus rate = 1/20
combined rate = 1/40 + 1/20 = 3/40

time at combined rate = 1/(3/40)
= 40/3 minutes
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