Jawabanmu

2014-09-12T11:20:03+07:00
15m/detik = 54km/jam

1km/jam=10/36m/s
15m/detik=Xkm/jam
Maka :
10X/36 = 15
10x = 36 . 15
10x = 540
x = 540 /10
x= 54
2014-09-12T11:24:31+07:00