An airplane's average speed from San Diego to Dallas 1,359
can be calculated using the function s(t) = where
tis the number of hours of travel. When there are
tailwinds, the increased speed can be calculated using
the function
w(s) = fs, where fis the percent increase as a decimal.
On a given day, the tailwinds caused the average
speed to increase by 2.5%, or w(s) = 1.025s.