Car travels at a constant speed.

What is the car's speed between checkpoints, expressed as a unit rate?
Use the information given in the picture.

Math item stem image

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.