# Running Around the Whole World

Our fan Valeria M. in Spain asked us, how long would it take to run all the way around the world? Believe it or not, a few runners have already done it. Kevin Carr of England ran around Earth in…can you guess how long it took him? Weeks? Months? Years? He did it in an amazing 621 days! (One year has 365 days.) That’s a distance of about 25,000 miles if you ran the biggest possible circle. The question is, what would be the absolute fastest time if a person could run without stopping? Remember, Kevin had to sleep, eat, and rest his feet. As we’ll find out below, running without stopping would be way faster.

Wee ones: If you run 4 miles and your dog runs 1 mile farther, how far does your dog run?

Little kids: If you run 2 miles from home to the park, then 3 miles more to the ice cream shop, and finally 4 more miles home, how many miles do you run?  Bonus: If you wanted 11 miles total of running, which part of that trip should you run again?

Big kids: If you could run 10 miles an hour for a whole 24-hour day, how many miles would you cover?  Bonus: Then about how many days would it take to run the 25,000 miles around our planet?

The sky’s the limit: If Kevin finished this 621-day run in April 2015, in about what month and year did he start? (You can assume 30 days per month, and count from end of April so the 21 days beyond 600 don’t carry you over another month).