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Speed is expressed as the ratio of a body's distance traveled divided by the time it took to cover the distance.

The speed is almost always expressed in meter per second (m/s).

The concept of speed is that it is a scalar quantity. As a result, just the magnitude is required to describe speed. There is no need for guidance.

Velocity is the ratio of a body's displacement to the time it takes to complete that dislocation.

The quantity of velocity is a vector quantity. It is critical to provide both magnitude and the direction with the magnitude. It also uses the same SI unit; however, it requires direction.

The negative sign shows the direction of the bird velocity in the preceding sentence, "A bird diving for prey has a speed of $\mathbf{10}\mathbf{\text{鈥尘/蝉}}$." As a result, a vector quantity is defined as one that possesses both magnitude and direction. In that case, the speed of the bird will be only $\mathbf{10}\mathbf{\text{鈥尘/蝉}}$.

Therefore, it is concluded that the speed of the bird is $\mathbf{10}\mathbf{\text{鈥尘/蝉}}$.