A body wlaks to his school at a distance of `6 km ` with constant speed of ` 2-5 km h^(-1)

Описание к видео A body wlaks to his school at a distance of `6 km ` with constant speed of ` 2-5 km h^(-1)

A body wlaks to his school at a distance of `6 km ` with constant speed of ` 2-5 km h^(-1)` and walks bach with a constant speed of ` 4 km h^(-1)~ What is avetage speed for the round trip in km h^(-1)` ?

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