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12 January, 20:15

Mr. sharrone can paper a room in 3 hours. his assistant needs 5 hours. if mr. sharrone works 1 hour and then his assistant completes the job alone, how long will it take the assistant to finish the job?

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  1. 12 January, 20:26
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    Mr Sharrone can do 1/3 of the job each hour

    the assistant does 1/5 of the job each hour

    1 (1/3) + H (1/5) = 1 (complete job)

    1/3 + 1/5 H = 1

    1/5 H = 1 - 1/3 = 2/3

    H = (2/3) / (1/5) = 10/3 = 3 1/3 hours to complete the job
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