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18 October, 17:05

Mr. rodriguez, a college instructor, can grade his class papers in 3 hours while it takes his assistant 4.5 hours. if mr. rodriguez graded the papers for 1 hour and then left the job for his assistant to complete, how long will it take his assistant to finish grading papers?

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  1. 18 October, 17:59
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    The rate of mr Rodriguez to complete 1 job is 1/3 while that of his assistant is 1/4.5.

    So if mr Rodriguez works for 1 hour, the job left would be 2/3 of the job. So the total time needed by assistant is:

    (2/3) / (1/4.5) = 3 hours

    Answer:

    3 hours
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