Question 1040806: John can finish a paper route in 5 hours, and Andrew can finish the same paper route in 7 hours. If they work together,how long would it take them to finish the paper route?
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! in one hour, John does 1/5 of the route and Andrew does 1/7
Together, they do 1/x of the whole route, x being unknown.
(1/5)+(1/7)=(1/x)
Multiply everything by 35x, the common denominator
7x+5x+35
12x=35
x=35/12 or 2 11/12 hours, or 2h55m
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