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Verified answer
1) 20 km/jam = 20 × 1.000/3.600= 5,6 m/detik
2) 15 m/dtk = 15 × ( 1/1000 ÷ 1/3.600)
= 15 × ( 1/1000 × 3600/1)
= 15 × 3.600/1.000
= 54 km/jam