Ironman Triathlon Distances

nothing at 2 mph stable cycles @ 20 mph, and runs at 9 mph. Assuming that no time is lost in transition, finding a formula for the distance d, covered miles, depending on the elapsed time in hours, h from the start of the race. yes, I do not know, I'm thinking they want a discontinuous function and I'm just looking for verification.

I do not know. I got a D in high
The Distance: A Triathlete’s Journey Movie Trailer