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Solution: How long will it take both crews to finish the same job, working together?

How long will it take both crews to finish the same job, working together?

Problem Statement: ECE Board November 1991

Crew No. 1 can finish installation of an antenna tower in 200 man-hour while Crew No. 2 can finish the same job in 300 man-hour. How long will it take both crews to finish the same job, working together?

Problem Answer:

Both crews will take 120 man-hours to finish the same job working together.

Solution:

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