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30m/1000km = 0,03/1/3600
3/100 x 3600/1 = 3x 36
= 108 km/jam
no 4
20m/detik= 20 x 3600 = 72.000 : 1000 = 72 km/jam
maka 20 m/det + 80 km/jam = 72 km/jam + 80 km/jam = 152 km/jam