Jawabanmu

2014-08-24T19:52:32+07:00
V = s/t = 54km / 2jam = 27km/jam atau 27000m/3600s = 7.5 m/s
2014-08-24T19:52:48+07:00
54 km = 2 jam
???     = 1 jam
: 54 / 2
= 27 km/ jam