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Four people can varnish the wooden deck of their ship in 3 hr and 14 min.
Suppose that three people have to do this job. If all people work at the same rate, how long will it take three people to varnish the deck?
We can do this using the man-hour method
Change 3 hr 14 min = 3.23 hrs
4 * 3.23 = 12.933 man hrs to complete the job
Let t = no. of hrs for 3 men to do the job
3t = 12.933
t = 4.31 hrs which is 4 + .31(60) = 4 hrs 18.67 min for 3 men to do it