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1 detik = 1 / 3600
2/ 100.000 : 1/3600 = 2/100.000 x 3600/1 = 7200/100.000 = 0,072 km/jam
2×1.000.000. =2.000.000
2.000.000×3600= 7.200.000.000km/jam
thanks