Question

A car travels at a constant speed. What is the cars speed between checkpoints expressed as a unit rate? Checkpoint As time being 1:00pm total miles driven being 120 and checkpoint Bs time being 3:00pm and the total miles being 208

Answer 1

Checkpoint A-> time being 1:00pm total miles driven being 120 and

checkpoint B-> time being 3:00pm and the total miles being 208

The distance between two checkpoint A  and B is 208 - 120 = 88 miles

Now the time between the two checkpoints = 3.00 - 1.00 = 2 hours

We need to find car speed between the checkpoints

We know Distance = speed * time

$speed = \frac{Distance}{time}$

$Speed = \frac{88}{2}$

Speed = 44 miles per hour

Answer 2

Average speed  = (distance covered) / (time to cover the distance).

Average speed between the checkpoints =

                                        distance between the checkpoints
                               divided by
                                        time between the checkpoints.

Distance between the checkpoints =

                                 (mileage at B) minus (mileage at A)

                               =      (208)          -            (120)  =  88 miles .

Time between the checkpoints =

                                 (time at B) minus (time at A)

                               =   (3:00 PM)  -  (1:00 PM)  =  2 hours .

Average speed between the checkpoints  = 

                                                                     (88 miles) / (2 hours)

                                                                   =         44 miles per hour .