40 : 1h 20 min = 40*3/4 =30 km/h
40km/ 1 1/3 h = 40km * 3/4 h = 30 km/h
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40 : 1h 20 min = 40*3/4 =30 km/h
40km/ 1 1/3 h = 40km * 3/4 h = 30 km/h