The average time that it takes for the car to travel the first 0.25m is s. The average time to travel just between 0.25 m and 0.50 m is s.
Given the time taken to travel the second 0.25 m section, the velocity would be m/s.

The path of a satellite orbiting the earth causes it to pass directly over two tracking stations a and b, which are 51 miles apart. when the satellite is on one side of the two stations, the angles of elevation at a and b are measured to be 87 degrees and 84 degrees, respectively. (a) how far is the satellite from station a? (b) how high is the satellite above the ground?