Please help me with this physics question.?

1. A car traveling at a certain speed v1 overtakes another car traveling at a slower speed v2 at A. An hour later the faster car reverses its direction, changes it’s speed to v3 and after some time meets the slower car now coming in the opposite direction at position B. The distance between the positions A and B is 10 km. Find the speed of the slower car if v1 - v2 = v3 + v2. Find the value of v2.