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:
a. her average driving speed
b. her average travel velocity

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 .