Then the speed of b is 0.1km/h.

Half the journey, that is, 0.5X km, takes 0.5X÷0. 1X=5 (hours).

So it took 14/3 hours for A to reach the midpoint.

The speed of obtaining armor is 0.5X/ 14/3=3/28X (km/h).

The distance between B and A is 1/3 hours.

A drove 25 kilometers.

So 28/3X × 1/3=25.

The solution is X=225/28.

So it's 225/28 kilometers apart.