There is a circular runway with a perimeter of 1km, and both runways start from the same place at the same time. If they run in the same direction 1 hour, Party A will run one lap more than Party B and run in the opposite direction, adding 4 points.
1 hour, A is one lap more than B, so A is faster than B1km/h.
Let a speed x+ 1, b speed x,
Running in the opposite direction,115 hours meet, so there is
(x+x+ 1)* 1/ 15 = 1
X = 7 and X+ 1 = 8 are obtained by solving.
That is, the speed of A is 8 kilometers per hour, and the speed of B is 7 kilometers per hour.