As 9h30, Osmar saiu de casa com sua bicicleta para visitar alguns amigos. Primeiramente, foi à casa de Odair, distante 12 km, chegando às 10h. Após conversar durante meia hora, Osmar se dirigiu à casa de Rosângela, mantendo velocidade constante de 20 km/h. Chegou lá às 11h30. Qual foi a velocidade escalar média de Osmar, em km/h, desde sua casa até a casa de Rosângela?
Por favor, me ajudem
Quero resolução, please*
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