Answer:
B. 20 meters/second, 20 meters/second
Explanation:
Velocity of John = 20 meters/second north = +20 meters/second
Velocity of Betty = 20 meters/second south = -20 meters/second
If north is considered as positive then south will be negative.
So, the velocity of John will be +20 meters/second and velocity of Betty will be -20 meters/second.
But, the question is about their speeds and not velocity. The signs represent the directions. Speed does not show direction.
So, speed of John and Betty is 20 meters/second.
