Local train heading for Westford at 60km/h and express train heading for Eastford at 80km/h pass each other at Centerville while heading in opposite directions along the straight roadbed. Westford and Eastford are 195 km apart, and if local train makes one 15 minute stop after passing Centerville express completes its run before local does. Determine maximum distance to nearest kilometer between Westford and Centerville.