Jawabanmu

2014-09-02T20:22:18+07:00
648 m
1.2 = 6/5 jam = 72 menit
90 x 72 = 648 m
2014-09-02T20:24:37+07:00
V = 90 m/menit = 5.4 km/jam
s = V * t
  =  5.4 km/jam * 1.2 jam
  = 6.48 km