Question

When Helen jogs, every 20 minutes she checks the total distance she traversed. One day, the first time she checked, Helen had jogged a distance of 2.5 miles, the second time she checked, she had jogged a total distance of 4.8 miles, and the third and final time that she checked, Helen found out that she jogged a total distance of 6.8 miles. What is the difference between her average speeds, in miles per hour, during the first 20 minutes of jogging and the last 20 minutes of jogging?

Answer 1

Answer

1.5 miles / hour

Step-by-step explanation

She jogged 2.5 miles in the first 20 minutes

Speed = distance/time

2.5 miles / 20 minutes = 0.125 miles / minute

Convert to hours

0.125 • 60 (60 minutes in an hour) = 7.5 miles / hour

She jogged 2 miles (6.8 - 4.8) in the last 20 minutes

2 miles / 20 minutes = 0.1 miles / minute

Convert to hours

0.1 • 60 = 6 miles / hour

7.5 miles / hour - 6 miles / hour

= 1.5