Which in is it Speed (S) or Velocity (V) ?

A bike goes 25 m/s toward

main street,

A person walks 4 mph.

A plane flies 200 m/s.

A bird flies 100 mph due

south,

Speed has only magnitude.

Velocity has magnitude and direction.

"A bike goes 25 m/s toward main street."

This includes a direction, so it is velocity (V).

"A person walks 4 mph."

This has only magnitude, so it is speed (S).

"A plane flies 200 m/s."

This has only magnitude, so it is speed (S).

"A bird flies 100 mph due south."

This includes a direction, so it is velocity (V).