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

1 Answer
Mar 25, 2018

Answer:

#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"#.