Respostas

2013-08-01T16:54:28-03:00
Vm=s/t
Vm=1200/20   
Vm=60m/s

vm=60/3.6=216
Vm=21,6 km/h

de novo sem ctza kk

2013-08-01T16:55:57-03:00
1200m  = 1,2 km
20 min = 0,33 h

1,2 / 0,33 = 3,6 km/h