Question 188
Fifteen minutes more - two cars depart, at the same time, from a city $A$ towards a city $B$. One travels at constant speed of $60~\mathrm{km}/\mathrm{h}$ and the other at constant speed of $70~\mathrm{km}/\mathrm{h}$. If the fastest car travels from $A$ to $B$ at $15$ minutes less than the other car, what is the distance between these two cities?