Dr Steve's Walking Speed

I try to take a walk every day. The walk is a loop, 2.2 miles long. I have "landmarks" at one mile and two miles. I am interested in how fast I walk, because I want the walk to be "aerobic" (exercises the heart and lungs). Usually aerobic speeds are given in miles per hour, but my stopwatch gives minutes and seconds; hence, conversion is needed.

To convert minutes to hours, divide by 60 (minutes per hour). For example, 15 minutes is a quarter of an hour, 30 minutes is half an hour.

For example, suppose I walk 1 mile in 18 minutes, 2 miles in 36 minutes, and 2.2 miles in 38 minutes.

Convert 18 minutes to hours: 18/60 = 0.3, exactly. So 1 mile in 18 minutes is 3.333 miles per hour. Similarly, 2 miles in 36 minutes is also 3.333 miles per hour. (Note: 333 is short for an endless string of "threes.")

Convert 38 minutes to hours: 38 minutes is 0.63333 hours. So, 2.2 miles in 38 minutes is 3.47 miles per hour (I probably speed up when the goal is in sight.)

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My most recent walk was 1 mile in 19 minutes, 2 miles in 35 minutes and 50 seconds, and 2.2 miles in 38 minutes and 20 seconds. You need to convert the seconds to decimal minutes; 50 seconds is 0.8333 minutes, and 20 seconds is 0.3333 minutes

What was my walking speed in miles per hour for 1 mile, 2 miles, and 2.2 miles?

Answers in Rot13:

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