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Milwaukee is 121 mi (air miles) due west of Grand Rapids. Maria drives 255 mi in 4.75 h from Grand Rapids to Milwaukee around Lake Michigan. Find:

AHer average driving speed
BHer average travel velocity

Verified Answer :

AL2006

a).
Average speed  =  (distance driven) / (time to drive the distance)

                       =  (255 miles) / (4.75 hours)

                       =     (255/4.75) (mile/hour)  =   53.7 miles per hour .


b).
Average velocity =

               (displacement)  /  (time for the trip)

           =  (distance and direction from
                       start-point to end-point,
                       regardless of the route)    /    (time for the trip)

           =      (121 miles west)  /  (4.75 hours)

           =      (121 / 4.75) (miles per hour west)

           =          25.5 miles per hour west .
 

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