4km/.21h4000m/780 segExplicación:4km=1000m/1km= 4000m13min=1h/60seg= .21h13min=60seg/1min= 780 seg
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4km/.21h4000m/780 segExplicación:4km=1000m/1km= 4000m13min=1h/60seg= .21h13min=60seg/1min= 780 seg