SOLUTION: it takes Mary 4 hours to paint a room, John 5 hours to paint the room, and Jacob 6 hours to paint the room. How long will it take if they work together?
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Question 1174038: it takes Mary 4 hours to paint a room, John 5 hours to paint the room, and Jacob 6 hours to paint the room. How long will it take if they work together? Answer by ikleyn(52810) (Show Source):
The combined rate of work is of the job per hour.
= use the common denominator of 60 = = .
It means that the three will complete the job in hours, or in 1 hours = approximately 1 hour and 38 minutes.
I rounded the minutes to closest greater integer value.
