Ответ:
120/60= 2ч
200/80 = 2ч40м
(120+200)/(2ч40+2ч+30м)= 61.9км/ч
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Ответ:
120/60= 2ч
200/80 = 2ч40м
(120+200)/(2ч40+2ч+30м)= 61.9км/ч