You Swim 1km in 25 minutes
You Swim 3km in 75 minutes + 15 tiring minutes and
You Swim 5 km in 125 minutes + 30 tiring minutes (15 tiring minutes every 2km after 1 km. (1, 3, 5, 7, 9, etc))
You have a 1 hour and 17 minute swimming lesson every week for a year. (52 weeks) If you swam laps every week how far would you have gone and how long would it take you?
