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211,5 km : 3 3/4 h = 2115/10 : 15/4 = 2115/10 * 4/15 = 141/5 * 2 = 282/5 =
= 56,4 km/h
211,5 km : 3,75 h = 2115,10 : 15,4 = 2115,10 · 4,15 = 141,5 · 2 = 282,5 =
= 56,4 km/h