SOLUTION: I need help with this question. Mr. Jacobs can correct 150 quizzes in 50 minutes. His student aide can correct 150 quizzes in 75 minutes. Working together, how many minutes will

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Question 179374: I need help with this question.
Mr. Jacobs can correct 150 quizzes in 50 minutes. His student aide can correct 150 quizzes in 75 minutes. Working together, how many minutes will it take them to correct 150 quizzes?
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
Jacobs can correct 150/50=3 of a problem per minute and the aid can do150/75= 2 of a problem per minute
:
together they can do: 2+3 problems per minute. 5/min
:
150 problems /5 (problems/min)= 30minutes correcting together