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A car from a place to b, in front of a section of ordinary highway, the rest of the road is the highway, highway than ordinary
Set: the distance from A to B is x meters, what about the length of the ordinary highway is (x-60)/2, and the length of the highway is (x+60)/2

Solution: (x-60)/2/60+(x+60)/2/100=3

(x-60)/120+(x+60)/200=3

Multiply the two sides of the equation by 600

5x-300+3x+180=1800

The equation is multiplied by 600

Both sides are multiplied simultaneously. p>

5x-300+3x+180=1800

8x=1920

x=240(km)