Question 149208
2x=express speed
x=local speed
50=miles


50/2x=(50/x)-1


Common denominator=2x
50/2x=100/2x-2x/2x


Eliminate the denominator
50=100-2x


Subtract 100 from both sides
-50=-2x


Divide by -2
25=x


2x=express speed
x=local speed


Local train: 25mph
Express train: 50mph