Question

An airliner travels 15 miles in 2 minutes.what is its speed in miles per hour

Answer 1

(15 miles / 2 minutes) times (60 minutes / 1 hour) = 15 x 60 / 2 = 450 miles per hour.

Answer 2

Remember:

1 mile per minute = 60 miles per hour

So:

$\frac{15 \ miles}{2 \ min}=\frac{15}{2}*60=450 \ miles \ per \ hour$