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2. 72000 : 3600 =20
3. 2400 : 60 = 40
4. 1800
2. 72 km /jam = 20 m / detik = 72x1000 : 1 x 3600 = 72000 : 3600
3. 2,4 km/jam = 40 m / menit = 2,4x1000 : 1 x 60 = 2400 : 60
4.18 m/detik = 1800 cm / detik = 18 x 100