A and B leave from AB and meet each other in two hours. Then a arrives at B in 1.5 hours. At this time, B is 45 kilometers away from a, so a is needed AB the distance between the two places

Speed ratio 2:1.5 = 4:3
The distance between AB and ab is 45 (1-3 / 4) = 180km

It is known that a travels 40km per hour and B 45km per hour from a to B. after a travels 30km, B sets out. As a result, B arrives half an hour earlier. Find the distance between a and B. (try to use one variable linear equation)

Suppose the distance between a and B is x km
（X-30）÷40=X÷45+0.5
9X-270=8X+180
X=270+180
X=450
A: the distance between a and B is 450 km
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