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72 km/jam = ...... m/detik
72 km/1 jam = 72000m/3600 detik
= 20 m/detik
contoh 2
20 m/detik = ....... km/jam
20 m/ 1 detik = (20/1000) : (1/3600)
= (20 × 3600) : (1 × 1000)
= 72000 : 1000
= 72 km/jam