Speed is a distance that will be travelled on a certain time
While Velocity is a speed with a direction example 15 miles per hour North
Speed is a scalar quantity and Velocity is a vector quantity
Speed-is the measurements of distance move during a period of time.
Velocity -indicates the speed and tell the direction of the movement
Speed,being scalar quantity, is the rate at which an object covers distance.The average speed is the distance (a scalar quantity) per time ratio.Speed is ignorant of direction.On the other hand,Velocity is a vector quantity, it is direction aware