Train ‘M’ and train ‘N’ depart from stations ‘A’ and ‘B’ respectively, heading towards each other at the same moment. After 10 hours, they meet. At that point, train ‘N’ had travelled 150 km more than train ‘M’. If the total distance between stations ‘A’ and ‘B’ is 850 km, how far did train ‘M’ go in 6 hours?