Sumati travelled from point A to point B at 475 m/min. The moment that Sumati reached point B, Rachna set off from point B, at a speed 1.6 times the speed at which Sumati travelled and reached point C. If the total distance covered from A to C through B was 45.6 km and the time taken from when Sumati started from point A to when Rachna reached point C was 75 minutes, what is the distance between A and B?