Jawabanmu

2014-06-03T21:07:33+07:00
Waktu = 17.00 - 13.30 = 4.30 ( 4 1/2 jam)
kecepatan = 189 : 4/2 = 94,5 km/jam
(kalo ga salah caranya kaya gitu)
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Jawaban paling cerdas!
2014-06-03T21:13:55+07:00
S = 189 km = 189000 m
t = 17.00-13.30 = 3,5 jam = 12600 s

v = s/t
   = 189000/12600
   = 15 m/s
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