Max completed a 10 mile run in 1 hour 20 minutes. Which dimensional analysis would you use to find her average speed in miles per hour?

Question

10 miles1.2 hours×24 hours1 day
10 miles1.2 hours×24 hours1 day

10 miles120minutes×60 minutes1 hour
10 miles120minutes×60 minutes1 hour

10 miles80minutes×60 minutes1 hour

Answer 1

The correct dimensional analysis would be:

10 miles1.2 hours × 1 hour60 minutes

This simplifies to:

10 miles0.02 hours

To find the average speed in miles per hour, we divide the distance by the time:

10 miles0.02 hours = 500 miles per hour