SSC CGL 3 Dec 2022 Shift 1 Paper

A car starts from point A towards point B, travelling at the speed of 20 km/h. 1$\frac{1}{2}$hours later, another car starts from point A and travelling at the speed of 30 km/h and reaches 2$\frac{1}{2}$hours before the first car. Find the distance between A and B.