Consider the question. Arlene hiked 24 miles on Saturday, carrying a 60-pound backpack. She is exactly 5 feet tall. She spent 6 hours hiking. The temperature during the day was 60 degrees Fahrenheit. What was Arlene's average hiking pace, in miles per hour?
 If the answer is '4'; explain the reasoning:
She hiked 24 miles. She spent 6 hours hiking. Her average pace was 24 / 6 = 4 mph.