SOLUTION: Mike, an experienced bricklayer, can build a wall in 6 hours, while his son, who is learning, can do the job in 12 hours. How long, in hours and minutes, does it take for them to b
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-> SOLUTION: Mike, an experienced bricklayer, can build a wall in 6 hours, while his son, who is learning, can do the job in 12 hours. How long, in hours and minutes, does it take for them to b
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Question 1139729: Mike, an experienced bricklayer, can build a wall in 6 hours, while his son, who is learning, can do the job in 12 hours. How long, in hours and minutes, does it take for them to build a wall together? Answer by ikleyn(52756) (Show Source):
Mike makes of the job per hour.
His son makes of the job per hour.
Working together, they make + = = = of the job per hour.
Hence, it will take 4 hours for them to complete the job working together.
