Question

The maximum speed of the Tupolev Tu-144 airline is 694 m/s. What is this speed in kilometers per hour???

Answer 1

There are 60 seconds in 1 minute and 60 minutes in 1 hour.

and there are 1.609km in 1 mile, so, let's use those ratios.

$\bf \cfrac{694~\underline{mile}}{\underline{sec}}\cdot \cfrac{60~\underline{sec}}{\underline{min}}\cdot \cfrac{60~\underline{min}}{hr}\cdot \cfrac{1.609~km}{\underline{mile}}\implies \cfrac{694\cdot 60\cdot 60\cdot 1.609~km}{hr}$

and I'm sure you know how much that is, since is just a product.