2D projectile motion: Vectors and comparing multiple trajectories

Toy cars $1$‍, $2$‍, and $3$‍ are launched horizontally with the trajectories shown below. Cars $1$‍ and $2$‍ are launched from a $15\text{m}$‍ high cliff, while Car $3$‍ is launched from a $30\text{m}$‍ high cliff. We can ignore air friction.