1(1)110/12.97 = 8.48111m/s
(2) (50-30)/(6.11-3.90) = 9.43396m/s
2(1)21:50-17:30+24=28h20min
(2)19:10-17:30=1h40min=5/3h
100km/(5/3h)=60km/h
(3) 6772+228=7000m=7km
7km/(60km/h)=0.11167h=420s
1(1)110/12.97 = 8.48111m/s
(2) (50-30)/(6.11-3.90) = 9.43396m/s
2(1)21:50-17:30+24=28h20min
(2)19:10-17:30=1h40min=5/3h
100km/(5/3h)=60km/h
(3) 6772+228=7000m=7km
7km/(60km/h)=0.11167h=420s