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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.

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Q: World class swimmers can swim 100 meter freestyle in about 55 seconds what is their approximate average speed?
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