passenger car and a truck are traveling towards each other from places A and B at the same time, and meet at a distance of 15 kilometers from the midpoint. It is known that the ratio of the speed of the bus to the speed of the truck is 7:5. How many kilometers is the distance between places A and B?
客车和货车同时从甲、乙两地相向而行，在离中点数15千米处相遇，已知客车速度和货车速度的比是7：5，甲、乙两地的路程是多少千米？
<result>15</result>