A swimmer swims from the north end to the south end of a 50 m pool in 25.2 s and makes the return trip to the starting position in 28.7 s. What is the average velocity for the first half of the swim?
What is the average velocity for the second half of the swim?
What is the average velocity for the round trip?

What is the shortest period of time in which a bacterium could drift at a constant speed of
4.2 mm/s across a petri dish with a diameter of 9.3cm?

Marc and Ana walk with a velocity of 1.24 m/s eastward. If it takes them 9 min to walk to the store, how far have they walked?