Both of them are moving with constant acceleration, 1,8 m/s ² for the car and 1,2 m/s ²for the truck, and they cross over when the car is at 45 meters from its departure spot.
KINEMATICS, Uniformly Accelerated Motion Ex 13, EXERCISES OF PHYSICS onlineģ.43 - A car and a truck start simultaneously, from rest, with the car at some distance behind the truck.