Ответ:
vср=S/t=S / (S/3:v1+2S/3:v2) = 1 / (1 / (3v1) + 2 / (3v2))
2 / (3v2) = 1/vср-1 / (3v1)
v2=2/3*1 / (1/vср-1 / (3v1)) = 2/3*1 / (1/90-1 / (3*60)) км/час = 120 км/час
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Ответ:
vср=S/t=S / (S/3:v1+2S/3:v2) = 1 / (1 / (3v1) + 2 / (3v2))
2 / (3v2) = 1/vср-1 / (3v1)
v2=2/3*1 / (1/vср-1 / (3v1)) = 2/3*1 / (1/90-1 / (3*60)) км/час = 120 км/час