Question

please answer!!!???

Answer 1

in a bike race, a rider covers a 5-mi flat stretch of road at a speed of x mi/h. she then doubles her speed down a hill 1 mi long. finally, she reduces her downhill speed by 12 mi/h as she rides the last she mi of the race. what function gives the time t it takes the rider to finish the race in terms of s?

Answer 2

Please correct the typo in "....as she rides the last she mi of the race"

Answer 3

in a bike race, a rider covers a 5-mi flat stretch of road at a speed of x mi/h. she then doubles her speed down a hill 1 mi long. finally, she reduces her downhill speed by 12 mi/h as she rides the last mi of the race. what function gives the time t it takes the rider to finish the race in terms of s?

Answer 4

Time = distance divided by speed
\[t=\frac{d}{s}\]
\[t _{1}=\frac{5}{x}\]
\[t _{2}=\frac{1}{2x}\]
\[t _{3}=\frac{1}{2x-12}\]
The reqired expression is:\[T(total)=\frac{5}{x}+\frac{1}{2x}+\frac{1}{2x-12}\]