Jawabanmu

2014-06-07T21:10:56+07:00
2014-06-07T21:14:23+07:00
V = jarak : waktu
   = 3/4 : 1/4
   = 3/4 x 4/1
   =3/1 = 3 km/jam

*v : kecepatan
15 menit = 1/4 jam