Morgans average time to swim in a freestyle race is 29.95 seconds. which distance does she most likely Swim

50mm
50cm
50km
50m

mmmm, lets see

50 mm is about the length of my little finger
50 cm is a little more than the length of the computer monitor in front of me
50 km would take me about 1/2 to drive by car ,
so .....
what do you think ?