# Kinematics' equations

Three cars leave $$A$$ for $$B$$ in equal time intervals. They reach $$B$$ simultaneously and then leave for point $$C$$ which is $$120 \text{ km}$$ from $$B$$. The first car arrived there ( at $$C$$) an hour after the second car, and third car, having reached $$C$$, immediately reverses the direction and $$40\text{ km}$$ form $$C$$ meets the first car. Find the speed of the first car (in $$\text{km/hr}$$).

×