Respostas

2013-09-14T23:35:00-03:00
3h20min = 200 min

min         km/h
200 -----  18
x    ----- 15
x= 200*18 / 15
x = 240 min ou 4h
1 1 1
2013-09-15T00:06:51-03:00
3h 20 mim = 3,333h
Vm= S/T      S = Vm . T     S1 = S2
S1 = 18 . 3,333   S2 = 15 . T
18 .  3.333  = 15 T
15T=  60
T= 60/15
T= 4h