SOLUTION: If it takes A 3 days to dig a ditch. B 6 days and C 12 days. How long will it take them to finish the job if they do it together?
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Question 894084: If it takes A 3 days to dig a ditch. B 6 days and C 12 days. How long will it take them to finish the job if they do it together? Answer by richwmiller(17219) (Show Source):
You can put this solution on YOUR website! 1/3+1/6+1/12=1/x
4/12+2/12+1/12=1/x
7/12=1/x
x=12/7 days
check
12/7/3+12/7/6+12/7/12=1
4/7+2/7+1/7=1
7/7=1
ok
