Take the elapsed time away from the end time.
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add start +Elapsed = and get end time
Find the distance of the race. Find the cyclist's start time. Find the cyclist's finish time. Elapsed time = Finish time - Start time. Average speed = Distance/Elapsed time.
The elapsed time IS 2 hours 15 minutes.
Elapsed time
It is 137 - 108 = 29 units of time.