Sun City is a distance 230 km from Moon City when traveling along a straight highway that continues to extend beyond both cities. Suppose that Kharim passes Sun City at 4:00pm (while driving in the direction of Moon City) and remains at a constant speed of 80 km/hr. Bai passes Moon City at 4:15pm (driving in the direction of Sun City) and stays at a constant speed of 60km/hr.