Horsepower of an Ox

In many countries, oxen, guided by children, plow straight, level furrows through soil. The ox of the figure pulls its plow a length of 200 meters in five minutes.
Calculate the least average horsepower expended by the ox.

In many countries, oxen, guided by children, plow straight, level furrows through soil. The ox of the figure pulls its plow a length of 200 meters in five minutes.
Calculate the least average horsepower expended by the ox.