Can somebody please help?
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17) 4000/20 × 60/1000 = 12 km/h
18) 6000/45 × 60/1000 = 8 km/h
19) 40/8 × 3600/1000 = 40/8 × 18/5 = 18km/h
20) 175/35 × 18/5 = 18km/h
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