When meeting, the time is fixed, and the distance is directly proportional to the speed. Distance of Party A: Distance of Party B = Speed of Party A: Speed of Party B = 2: 5.
The distance between a and b =2 1÷(5-2)×(2+5)=49 km.
2: 2 1 min =7/20 hours
B 7/20-hour driving distance =49×2/(2+5)= 14 km.
Motorcycle speed =14 ÷ 7/20 = 40km/h.
Single speed = 40× 2/5 =16 km/h.