Question

A runner wants to run 13.1 km . She knows that her running pace is 6.2 mi/h .How many minutes must she run? Hint: Use 6.2 mi/h as a conversion factor between distance and time.

Answer 1

Answer:

• 79 minutes

Explanation:

1) Convert the distance, 13.1 km to miles

• Conversion factor:

        1 = 1 mi / 1.61 km

• 13.1 km [ 1 mi /  1.61 km ] = 8.1336 mi

2) Use 6.2 mi/h as a converstion factor between distance and time

• 8.1366 mi × 1 / [6.2 mi/h] = 1.3124 h

3) Convert 1.3124 h to minutes

• 1.3124 h × [ 60 min/h] = 78.7 min

Rounding to the nearest minutes (two significant figures):

• 79 min ← answer