A cyclist leaves home and rides due east for a distance of 7

A cyclist leaves home and rides due east for a distance of 70 km. She returns home on the same bike path. If the entire trip takes 4 h, what is her average speed?

Solution

A cyclist leaves home and rides due east for a distance of 70 km. She returns home on the same bike path. If the entire trip takes 4 h, what is her average speed?
averate speed = total distance / total time
average speed = (70+70)/4