three
Divide Km trav. by time spent travelling, in hours. If car was driven for 20 minutes and went 30km, for example, then 30km / 0.333 hrs = 90 km per hr.
90 kph = 25 m/s
30km/h = 30km/60min = 5km/10min 20km/h = 20km/60min = 10km/30min 5+10=15km
232 minutes
There are 133 minutes