2. Two cars started from the same point on a circular track 150 km long, heading in opposite directions. After some time, they met and continued moving in the same directions. Two hours after the start, the cars met for the second time. Find the speed of the second car if the speed of the first car is 60 km/h.
Solution. Let the speed of the first car be $x$ km/h, then their closing speed will be $(x+60)$ km/h. Obviously, in two hours they traveled two laps, i.e., 300 km, hence $2 \cdot(x+60)=300$, from which we get that $x=90($ km/h).

Answer: 90 km/h