Odpowiedź :
S=S/3 +S/3 +S/3
t =t1+t2+t3
t1 =S/3 :5 =S/15
t2=S/3 :12 =S/36
t3 =S/3 :10 =S/30
t =S/15 +S/36+S/30 =S*(1/15 +1/36+1/30)
vśr =S : t = S/[S*(1/15+1/36+1/30)] = 1/(1/15+1/36+1/30)
Obliczmy
1/15 +1/36 +1/30 =2/30+1/30 +1/36 =3/30 +1/36 =1/10 +1/36=
= 36/360 +10/360 = 46/360 =23/180
vśr =1/(23/180) = 1 : 23/180 = 1* 180/23 = 180/23 =
= 7 i 19/23
t =t1+t2+t3
t1 =S/3 :5 =S/15
t2=S/3 :12 =S/36
t3 =S/3 :10 =S/30
t =S/15 +S/36+S/30 =S*(1/15 +1/36+1/30)
vśr =S : t = S/[S*(1/15+1/36+1/30)] = 1/(1/15+1/36+1/30)
Obliczmy
1/15 +1/36 +1/30 =2/30+1/30 +1/36 =3/30 +1/36 =1/10 +1/36=
= 36/360 +10/360 = 46/360 =23/180
vśr =1/(23/180) = 1 : 23/180 = 1* 180/23 = 180/23 =
= 7 i 19/23
1 odcinek - 5km/h
2 odcinek - 12km/h
3 odcinek - 10km/h
oblicz srednia!!
5km+12km+10km=27km
27km / 3 = 9km
odp.:srednia predkosc wynosi 9 km/h
2 odcinek - 12km/h
3 odcinek - 10km/h
oblicz srednia!!
5km+12km+10km=27km
27km / 3 = 9km
odp.:srednia predkosc wynosi 9 km/h