A runner wants to run 12.3 km. She knows that her running pace is 6.8 mi/h.

How many minutes must she run? Hint: Use 6.8 mi/h as a conversion factor between distance and time.

To answer this question, you need to know how to convert mile into kilometer. One mile is equal to 1.60934km. Then the runner speed in km/h should be: 6.8 mi/h * 1.60934km/mi = 10.94km/h.

Then the time needed should be:

time = distance / velocity = 12.3km / (10.94km/h) = 1.1243 hour * 60 minute/hour = 67.45minutes