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Um avião voa 1800 \text{ km} a uma velocidade média de 600 \text{ km/h} em uma direção e retorna ao ponto de partida a uma velocidade média de 400 \text{ km/h}. Qual foi a velocidade média do avião durante toda a viagem?

A velocidade média é a média harmônica das velocidades médias de ida e volta.

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