Two cars travel from different locations at constant speeds. To meet each other after starting at the same time, they take 1.5 hours

Two cars travel from different locations at constant speeds. To meet each other after starting at the same time, they take 1.5 hours if they travel towards each other, but 10.5 hours if they travel in the same direction. If the speed of the slower car is 60 km/hr, then the distance traveled, in km, by the slower car when it meets the other car while traveling towards each other, is

1. 150
2. 100
3. 90
4. 120

Ans: C.  90