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Verified answer
1. 4,5 jam 8 menit= (4,5 x 3600) + (8x60)
= 16.200 + 480 = 16.680 sekon
2. 108km/jam = 108x1000/3.600 = 30 m/s
3. 200g/cm³ = 200:1000/1:1.000.000
= 200/1000 x 1.000.000/1
= 200.000 kg/m³
4. 15 inchi = 15x2,54/100 = 38,1 cm = 0,381 meter