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Posted by on Monday, January 11, 2010 at 10:55pm.

A mail handler needs 3 hours to sort the mail, but with an assistant, it takes 2 hours. How long would it take the assistant to sort the mail working alone?

  • Math - , Tuesday, January 12, 2010 at 1:31am

    Let that assitant's time be t.

    1/2 = 1/t + 1/3 jobs per hour
    1/t = 1/6

    t = 6 hours

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