3 1/4 h = 3,25 h = 3,25 * 60 min = 195 min
195 min - 56 km
1 min - 56/195 km
60 min - 56/195 * 60 = 3360/195 km
3360/195 km = 672/39 km = 224/13 km = 17 3/13 km
Odp. 17 3/13 km/h
:)
