Mr. rodriguez, a college instructor, can grade his class papers in 3 hours while it takes his assistant 4.5 hours. if mr. rodrig uez 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?
1 answer:
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:
<span>3 hours </span>
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