Michiko walked a distance 1.60 km in 30 m. What was her average speed in m/s?

1 Answer
Nam D.
Mar 25, 2018

0.89 \ "m/s".

Explanation:

Well, she walked 1.6 \ "km" in 30 \ "min", and so her speed in "km/h" is:

(1.6 \ "km")/(30 \ "min")=(1.6 \ "km")/(0.5 \ "h")=3.2 \ "km/h".

The magical number, as I call it, is 3.6, which converts "m/s" into "km/h". Know that, 1 \ "m/s"=3.6 \ "km/h".

And so here, the speed in meters per second is:

(3.2)/(3.6)~~0.89 \ "m/s".

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