The speed of two cars (or people) ...) and * meeting time = meeting distance

V= speed. S= distance, t= time.

vt=s，s/t=v，s/v=t。

Note: Distance is not necessarily the distance to meet. The distance traveled should be calculated from the moment when two cars (or people) "leave" at the same time.

For example, A walked from A to B for 1 hour, and then B walked from B to A. T hours later, the two met, with a distance of S kilometers.

S kilometers here is the distance to meet, but not the distance from A to B. An hour's walking distance between S and A is the distance from A to B. 。