The distance travelled by Jane's trainer is 20 miles before meeting Jane.
Pythagoras theorem is used to show the relationship between the sides of a right angled triangle. It is given by:
Hypotenuse² = Leg 1² + Leg 2²
Let x represent the distance travelled by the trainer, hence:
x² = 12² + 16²
x² = 400
The distance travelled by Jane's trainer is 20 miles before meeting Jane.
Find out more on Pythagoras theorem at: https://brainly.com/question/343682