exam Maths Puzzle Numerical Ability

I need help solving this problem I do not have a clue how to do it...thank you for you help in advance

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exam Other Question

Given the points:
A (-3, 1)
B (0, -5)
C (6, -2)
Determine the coordinates for a point D, such that ABCD is a square. If a dirt track car is going around an oval dirt track that is 1/4 mile long, at a lap time of 13.6 seconds, what is an average speed the car is going per lap. Or what is an equation i can use to figure out the approxiamate speed of the car.