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18 August, 14:37

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?

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  1. 18 August, 14:40
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    6 hours

    Step-by-step explanation:

    Let the total work be X

    Combined speed: X/2

    Ron's speed: X/3

    Harry's speed: S

    X/2 = X/3 + S

    S = X/2 - X/3 = (3X - 2X) / 6 = X/6

    Harry's speed is X/6, so he'll take 6 hours
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