This question doesn't say what type of math expression is desired. Given the input data, I've chosen to find Jack's average speed during the 50 meter freestyle:
One side is 6 (bottom of triangle) and two sides are 8 (two main sides of the triangle)
Step-by-step explanation:
The reason this is is because two sides of a regular triangle are the same while one is not. (The bottom of the triangle) So, the bottom is shorter than the sides.