Thomas swims 50,000 meters in 5 weeks.
Thomas swims 10 kilometers each week. To convert kilometers to meters, we multiply by 1,000 because there are 1,000 meters in a kilometer.
10 km * 1,000 meters/km = 10,000 meters
Thomas swims 10,000 meters each week. Now, to find out how many meters he swims in 5 weeks, we multiply the weekly distance by the number of weeks:
10,000 meters/week * 5 weeks = 50,000 meters