Two cars P and Q are moving on a road in the same direction. Acceleration of car P increases linearly with time

Two cars P and Q are moving on a road in the same direction. Acceleration of car P increases linearly with time whereas car Q moves with a constant acceleration. Both cars cross each other at time t = 0, for the first time. The maximum possible number of crossing(s) (including the crossing at t = 0) is ________ .      (JEE-2025)