Respostas

2014-05-02T15:08:06-03:00
2014-05-02T15:11:18-03:00
X2/T1=30
30.T1=X/2
T1=X/60


X/2/T2=60
T2=.60=X/2
T/2=X/120

X/2 + X/2 / T1+ T2= VELOCIDADE MEDIA
X2/2/X60 + X/120 =
X/2X+X/120=
X/3X/120=
120X/3X= VELOCIDADE MÉDIA = 40KM/H