I'm stuck on number 4... help please?

Average speed = (distance covered) / (time to cover the distance) =                                      (5m)  /  (15 sec) =                                      (5/15) (m/s)  =  1/3 m/s .Average velocity =           (displacement) / (time spent traveling)  in the direction of the displacementAverage velocity =  (5m) / (15 sec)  left =                            (5/15) / (m/sec)  left  =                               1/3  m/s  left.A number without a direction is a speed, not a velocity.

[tex]V= \frac{\Delta S}{\Delta t} = \frac{5}{15} = \frac{1}{3} m/s[/tex]