Answer: We are given that Bob completes a 5-kilometer race in 28 minutes. We need to find his average time per mile.
First, let's convert the distance from kilometers to miles:
5 km = 3.1 miles (given)
Since Bob completes the race in 28 minutes, we can set up a proportion to find his average time per mile:
Total time ÷ Total distance = Average time per mile
28 minutes ÷ 3.1 miles = x minutes/mile
Now, we can solve for x:
x = 28 minutes ÷ 3.1 miles x = 9.03 minutes/mile
To convert the decimal part to seconds, we can multiply it by 60:
0.03 minutes × 60 = 1.8 seconds
So, Bob's average time per mile is approximately 9 minutes and 1.8 seconds, or 9:01.8.
Step-by-step explanation:
