Seriously? Some simple maths will give you your answer:
1km = 10 * 100m
Swimmers take 55 secs to go 100m. Assuming their speed is constant, it would take them 10 * 55 secs to go 1km. 10 * 55 = 550, so it takes 550 secs to travel 1km.
Divide this by minutes: (550/60=9.1667) which means that they swim at 9.1667km per hour.
1.82 m/s
150 seconds
Most likely 18 seconds or slower.
A good time would be 29 seconds.
There really isn't an average time because it varies about how fast people are. But I would say around 59.999 seconds?
The average time for an 8-year-old boy to swim 50m freestyle is typically around 45-60 seconds. However, this can vary depending on the swimmer's level of experience and training.
I think anything under 30 seconds is pretty good.
There are no 25 yard events event at the international level. Typically only very young swimmers (12 years and under) swim 25 yard events. However, given that the world record for the 50 yard freestyle is 18.47 (set by Cesar Cielo at the 2008 NCAA Championships), I would guess that the fastest 25 yard free ever swum would be 9.0 seconds or faster.
100m freestyle Michael phelps 46.65 seconds
D. 26.9 m/s
There was a tie with 52.70 seconds, which is the new Olympic record, between Penny Oleksiak and Simone Manuel. They will each receive a gold medal and there will be no silver medalist. Penny Oleksiak is from Canada and Simone Manuel is from United States.
Well, it depends on how hard and how many times a week they train. I have a 10 year old brother who swims 50 metres freestyle in 33 seconds, but he is a regional qualifier and is rather good for his age.