Making entity-to-entity teleportations instant

In a situation where an entity (call this entity B) is constantly teleported to another entity (call this entity A), entity B will fall behind entity A if the latter moves at a high enough speed (just slower than a player's default sprinting speed). The desired behavior would be to have entity B always have the same position as entity A, so that they both stay in the exact same position no matter how fast entity A is moving.