Math CentralQuandaries & Queries


Question from Fayeann, a student:

What amount of time will it take a person running 7 m/s to travel a distance of 5 km?

Hi Fayeann,

If this person can run 7 metres in 1 second then she can run 14 metres in 2 seconds, 21 metres in 3 seconds and so on. To obtain the time in seconds I took the distance (say 21 metres) and divided by 7 ($\large \frac{21}{7} = 3$). You have a distance of 5 km = 5000 metres so divide 5000 by 7. Convert this time to minutes and seconds.

Is this a reasonable expected time to run 5km? Have a look at the world record times.


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