TUTOR PERSONAL CLASES GMAT GRE SAT MATHEMATICS. +56937780070

TUTOR PERSONAL GMAT GRE SAT MATHEMATICS. Estaré encantado de ayudarte a nivelar tus competencias en GMAT QUANT, GRE QUANT o SAT QUANT +56937780070. DISTANCE / RATE mixture problem

A man can row at a speed of 5 km/hr in still water. If he rows a certain distance upstream and back to the starting point in a river which flows at 1.5 km/hr, what is his average speed for the double journey?

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