Alex can pour concrete on a walk way in x hours alone while andy can pour concrete on the same walkway in two more hour than alex
what are the given?
what is the equation in getting the number of concretes per hour if they work together?
how fast can they pour concrete if they work together?

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Answers

2015-06-27T22:01:30+08:00
Let x - alex
     y - andy
y=x+2

1/x + 1/x+2 = 2x+2/x(2x)
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