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.

A

300 km

B

240 km

C

260 km

D

280 km