We have that the Magnitude of Velocity is equal to Speed when You are half way back to A from B.
[tex]4V=S[/tex]
From the Question we are told that
Trip from city A to B and back
Generally
Velocity This is defined as the distance cover over time ratio with respect to direction
While
Speed
This is the distance cover over time ratio with no regard to direction.
With the above definitions in mind
Magnitude of Velocity with respect to direction of back forth has a net of zero and
While Magnitude Speed of increases as it returns to A after going to B
in conclusion
The Magnitude of Velocity is equal to Speed when You are half way back to A from B.
4V=S
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