Answer:
2.3 hours rounded I suppose.
Step-by-step explanation:
You have jogged 5 miles from the park at a rate of r miles per hour. On your way back to the park your average speed increases by 1 mile per hour.
a. Write an expression for the time t (in hours) it takes to jog 5 miles
from the park as a function of your average speed r (in miles per hour) ___________
b. When you run back to the park, your average speed increases by 1 mph.
Write an expression representing your new speed. ___________
c. Write an expression for the time t(in hours) it takes to jog 5 miles
back to the park. ___________
d. Use your answers to parts a and c to write an expression that gives the total jogging time T (in hours) as a function of your average speed r (in miles per hour) when you are jogging away from the park. Write your answer as a single rational expression.
e. Find the total jogging time if you jogged away from the park at an average speed (r) of 4 miles per hour. Round your answer to the nearest tenth.
hours or 135 minutes
2.3 hours rounded I suppose.
