Respostas

2014-03-13T21:08:45-03:00
Resposta

V1 = 50km/h
V2 = 75km/h

Formula

V =  \frac{2.V1.V2}{V1 + V2}

V =  \frac{2.50.75}{50 + 75}

V =  \frac{7500}{125}

V = 60km/h
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