Question

How long will it take you to ski a distance of 36 miles at a speed of 3 miles per 30 minutes

Answer 1

if one can cover 3 miles in 30 minutes, how many minutes will it be for 36 miles?

`\bf \begin{array}{ccll} minutes&miles\\ \cline{1-2} 30&3\\ x&36 \end{array}\implies \cfrac{30}{x}=\cfrac{3}{36}\implies \cfrac{30}{x}=\cfrac{1}{12}\implies 360=x`