Cindy can run at 3 miles per hour and walk at 1 mile per hour. If she runs for half a mile and then walks for half a mile, how many minutes will it take her to travel the full mile?
Thoughts? Step-by-step reasoning:
It will take her 0.5 miles / 3 mph * (60 minutes / 1 hour) = 10 minutes to run half a mile. It will take her 0.5 miles / 1 mph * (60 minutes / 1 hour) = 30 minutes to walk half a mile. Her total time is 10 + 30 = 40 minutes.
Thus, the answer is 40.