Answer :
To determine who travels faster we need to determine the quotient between the distance and the time for each individual.
For Nick we have:
[tex]v_N=\frac{28}{4}=7[/tex]For Susan:
[tex]v_S=\frac{45}{3}=15[/tex]Since:
[tex]v_S>v_N[/tex]This means that Susan travels faster than Nick.