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Mathematical answer
1: When meeting, Party B traveled more distance than Party A =10.5+10.5 = 21km.

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.