Which of the following best represents the average rate at which a person can quickly walk?

approximately 3.1 miles per hour

Conversion:

3 km - 3000m

0.5 km - 500 m

1.05 km - 1050 m

Solution:

3, 000 m = 500m + 1050m + n

3, 000 m = 1550m + n

n = 3, 000 m - 1550m

n = 1450m

1.45 kilometers must PJ hike to reach the river.