Question

In a bike race, a rider covers a 5-mi flat stretch of road at a speed of s mph. She then doubles her speed down a hill 1 mi long. Finally, she reduces her downhill speed by 12 mph as she rides the last 3 mi of the race. What function gives the time t it takes the rider to finish the race in terms of s.

Answer 1

T= 5/s + 1/2s + 3/(2s-12)