A carpenter has a board that is 20 feet long. He wants to make 6 table legs that are all the same length. What is the longest each leg can be?

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.