Question

A car travels at a constant speed. What is the car's speed between checkpoints, expressed as a unit rate? Checkpoint A 1:00 PM Total miles driven 120. Checkpoint B 3:00 PM Total miles driven 208.

Answer 1

Average speed

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 - time at A

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

Average speed between the checkpoints =

(88 miles) / (2 hours)

=44 miles per hour .