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Question

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?
8 years ago

Answers

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
8 years ago

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