SOLUTION: If A completes a particular work in 4 days and B the same work in 12 days. How many days will it take if they work together?
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Question 909359: If A completes a particular work in 4 days and B the same work in 12 days. How many days will it take if they work together? Answer by richwmiller(17219) (Show Source):
You can put this solution on YOUR website! 1/a+1/b=1/x
1/4+1/12=1/x
12/48+4/48=1/x
16/48=1/x
x=48/16
x=3 hours working together
check
x/a+x/b=1
x/4+x/12=1
3/4+3/12=1
0.75+0.25=1
1=1
ok
