tolong pakai cara nomor 4 terimah kasih

a.850 cm= 8,5m
b.1000 m=100.000 cm
c.2jam=7.200dtk

a.850 cm = ...... m
= 850 : 100 = 8,5 m
b.1000 m = ...... cm
= 1000 x 100 = 100.000 cm
c.2 jam = ...... detik
= 2 x 3600 = 72.000
d.72km/jam = ......m/detik
= 72.000 : 3600 = 20m/detik