Odpowiedź:
V1 = 36 km/h
V2 = 0 km/h
V3 = 40 km/h
t1 = 10 min = 0,17 h
t2 = 20 min = 0,33 h
t3 = 15 min = 0,25 h
s1=V1*t1
s2=V2*t2
s3=V3*t3
s1=36*0,17
s1=6,12 km
s2=0*0,33
s2=0 km
s3=40*0,25
s3 =10 km
s = 6,12+0+10
s = 16,12 km
Vsr = 16,12 km/0,75 h = 21,49 km/h