Question

You fly in a helicopter for 20 minutes that goes at a speed of 240 kilometers per hour. How far did you go?

Answer 1

keeping in mind that there are 60 minutes in 1 hour, thus 240 kilometers per hour is just 240 kilometers in 60 minutes.

$\bf \begin{array}{ccll} minutes&km s\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 60&240\\ 20&x \end{array}\implies \cfrac{60}{20}=\cfrac{240}{x}\implies 3=\cfrac{240}{x} \\\\\\ x=\cfrac{240}{3}\implies x=80$

Answer 2

You have traveled 80km