Question

A model airplane flies18 feet in 2 seconds. What is the airplane's speed in miles per hour? Round your answer to the nearest hundredth.

Answer 1

$Formula\ for\ speed\\\\ v=\frac{s}{t}\\\\ s=18\ feet\\\\ t=2\ seconds\\\\ v=\frac{18}{2}=9\frac{feet}{second}\\\\ 1\ foot= 0.000189393939\ miles\\\\ 1\ second=\frac{1}{3600}hour\\\\ 9\frac{feet}{second}=9*\frac{0.000189393939}{\frac{1}{3600}}=6,156\frac{mile}{hour}\approx6,16\frac{mile}{hour}$