A Racing Chicken and a Fast Squirrel Join Turtle and Rabbit

Essay

A racing chicken and a fast squirrel join Turtle and Rabbit in an over-and-back race, with known data as in the drawing below.
A) Going the same speed over and back, Rabbit just barely won the race. What was Rabbit's approximate speed? Explain your thinking.
B) Who came in second, third, and fourth? (Indicate ties, if any. No explanation is required.)
C) At the halfway mark of the race (300 feet), what was the order of the animals? (Indicate ties, if any. No explanation is required.)
D) What was Chicken's average speed over?