Respostas

2014-03-19T18:59:42-03:00
Resposta

Tempo 1

T1 = 1 / 40

Tempo 2

T2 = 1 / 60

Tempo total

T = 1 / 40 + 1 / 60

T = 3 + 2 /120 

T = 5/120

T = 1 /24 h

D = 2km

V =  \frac{D}{T}

V =  \frac{2}{ \frac{1}{24} }

V = 2 . 24

V = 48km/h