“You somehow escaped its grasp; now you face a familiar choice”

Answer: 36 – Andy Brian and Cam run at speeds: a, b and c. Using time = distance/speed: Andy finishes in a time 100/a = 80/b. Brian finishes in a time 100/b = 80/c. Therefore, b = 0.8 x a and c = 0.8 x b. So, c = 0.64 x a. Hence, in the time it takes Andy to run 100m Cam has run 64m.

Click the string to retrace your steps.