Tolong pke caranya ya!!! 15 m/detik=...km/jam

1 jam = 3600 detik --> 1 detik = 1/3600 jam
1 km = 1000 m --> 1 m = 1/1000 km

Jadi, 
15 m/s = 15 x 1/1000 km / 1/3600 jam = 15 x 3600 / 1000 = 54 km/jam

15m=0,015
detik=1/3600
=0.015:1/3600=0.015×3600=54km/jam
maaf kalau salah