Question

Change 65 miles per hour to kilometer per minutes. Round to three decimals ​

Answer 1

One approach is as follows:

1. convert hours to minute:

  $\dfrac{65 ~miles}{1 ~hour}\cdot\dfrac{1 ~hour}{60 ~minutes}=\dfrac{65 ~miles}{60~minutes}$

(we'll finish the calculation at the end.

2. now covert miles to km:

   $\dfrac{65 ~miles}{60~minutes}\cdot\dfrac{1 ~km}{0.6213712~miles}=\dfrac{65 ~km}{60\cdot0.6213712~ min}$

Now throw that into a calculator: 1.743 km/min