200 cm / detik ______ km / jam

200: 100.000km/1 jam=200×1 jam/100.000=2/1000=0,002

1 cm = 1/100.000 km
1 detik = 1/3.600 jam

200 cm/detik
=200/100.000 ÷ 1/3.600
=2/1000 x 3600
=7,2 km/jam