The two vehicles of a and B run relatively from two places with a distance of 600km. The vehicle of a runs 45km per hour, and the vehicle of B runs 40km per hour Car a starts 2 hours before car B starts. How many hours later will car B meet car a? First order solution of one variable
Suppose that car B meets car a in X hours
45×2+(45+40)x=600
90+85x=600
85x=510
x=6
A: the first car will meet the first car after 6 hours
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