Velocity is a vector, so it contains two pieces of information:
- a magnitude, which is given by the speed
- a direction
Two objects, in order to have same velocity, should have both same speed and same direction. In this problem, only the following pair of sentences describe people with same velocity:
Valerie rides her bike south at 8 kilometers per hour.
Owen jogs south at 8 kilometers per hour.
In fact, both Valerie and Owen are moving at same speed (8 km per hour) in the same direction (south), so they have same velocity.