Question

Steve races to the nearest taco stand at lunchtime and sees that his pedometer recorded his peak speed at 76.7 cm/s. What was Steve's peak speed in kilometers per hour?

Answer 1

$1\ Km=100\times 1000\ cm\\1\ hour=60\times 60=3600\ sec$

Now

$1$ $\ cm=10^{-5}\ km\\$

$1\ sec=0.00027777777 \ hour$

Now

$speed=76.7\frac{\ cm}{sec}=\frac{76.7\times{10^{-5}}}{0.00027777777}\frac{\ km}{hour}=2.7612\ km\ hour^{-1}$