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A room can be cleaned in 2 hours if rob and Harry work together. Ron could clean it in 3 hours. How long can harry clean it?

 Mar 1, 2020
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Ron = R

Harry = H

 

1 / 2 - 1 / R = 1 / H

1 / 2 - 1 /3 = 1 / H, solve for H

H = 6 Hours it takes Harry to clean the room by himself.

 Mar 1, 2020

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