An Hour Before #2 - S3.E555

This week, the members are placed in a situation where they are given only an hour to complete the task that's given on the spot. Jae Seok has to sweep a 100m high bridge one hour before the tourists come. Jun Ha has to run a 10km marathon. Myeong Soo is back in the army. Will they be able to complete the given tasks before their time runs out?