What's the velocity of a bike ride taking 45 mins over a distance of 4km

The speed of the ride is

Speed = (distance covered) / (time to cover the distance)

Speed = (4,000 m) / (45 min)

Speed = 88.89 m/s

Speed = 1.481 m/s

Speed = 5.333 km/hr

There's not enough information given in the question to calculate the velocity of the ride. For example ...

- - If the ride was completely in a straight line, then the velocity would be exactly equal to the speed.

- - If the rider went 2km from his house and then 2km back home again, his velocity for the whole ride would be zero.

We just don't know from the information given.