Hello!
The answer is D. 1.5 hours
Why?
First we need to calculate the speed using the following formula and the given information:
[tex]x_{f}=x_{o}+v*t\\x_{f}-x_{o}=v*t\\\\d=v*t[/tex]
Where:
[tex]d=distance\\x_{f}=FinalPoint\\x_{o}=InitialPoint\\v=velocity/speed\\t=time[/tex]
By substiting we have:
[tex]v=\frac{distance}{time}=\frac{221.05miles}{4hours}=55.26\frac{miles}{hour}[/tex]
So, to calculate the time she took to cover the last distance, we need to use the calculated speed:
[tex]distance=v*t\\t=\frac{distance}{speed}\\t=\frac{83miles}{55.26\frac{miles}{hour}}=1.50hours[/tex]
The time she took to cover the last distance is D. 1.5 hours
Have a nice day!
