Respostas

2014-04-30T12:15:14-03:00
Vm = Δs
        -----
        Δt

4 = 12
      ----
      Δt

4Δt = 12
Δt = 12 / 4
Δt = 3 h 
2 5 2
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2014-04-30T12:19:44-03:00
Vm = 4km/h
d = 12km
∆t = ?

Vm = d/∆t
4 = 12/∆t
4∆t = 12
∆t = 12/4
∆t = 3h
2 5 2