Jawabanmu

2014-08-29T20:17:51+07:00
V = s / t
     (0,5jam) / (5km) = 2.5 km/jam
1 1 1
2014-08-29T20:19:20+07:00
30 menit = 1/2 jam
V = s / t
   = 5 km / 1/2 jam
   =10 km/jam