Meeting time

There are 2 points (A and B) 100 kms apart. A vehicle (VA) starts to travel from point A to point B and another (VB) from B to A at the same time (00:00:00). VA travels at a speed (km/h) equal to the distance-to-B + 13 at any time while VB travels at the speed of 61km/h at any time. So for example when VA is 91.1 kms away from B, its speed would be 104.1 km/h at that time. At what time do the two vehicles meet? Answer format: HH:MM:SS:ms (rounded to milliseconds) Example: 01:11:17:691