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2013-11-20T13:51:53-02:00
450              4

750              x


450*4 = 750 x

x= 1800/750

x= 2, 4 hrs  ou 2 hrs e 24 minutos
4 4 4
2013-11-20T14:06:34-02:00
V = e/t ---------- 450 = e / 4 -------------------- e  = 450 x 4 ==> 1800 km
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v = e/t ---------- 750 = 1800 / t  --------------------------- t = e/v ------- t = 1800/750 =>  2,4 horas