John is traveling north at 20 meters/second and his friend Betty is traveling south at 20 meters/second.
We know that the total distance covered divided by total time taken is called speed of an object. It is a scalar quantity i.e. it have only magnitude. While velocity is a vector quantity.
In this case, north direction is considered as positive while south direction is considered as negative.
So, John's speed is 20 meters/second and Betty's speed is 20 meters/second as speed is a scalar quantity.
