# A semi-truck traveling at an average speed of 70 miles per hour covers a distance of 35 miles. How long did it take?

Jul 28, 2018

It took $0.5$ hours.

#### Explanation:

Rearrange the formula for speed.

$\setminus \textrm{s p e e d} = \setminus \frac{\textrm{\mathrm{di} s \tan c e}}{\setminus} \textrm{t i m e}$

$\setminus \textrm{t i m e} = \setminus \frac{\textrm{\mathrm{di} s \tan c e}}{\setminus} \textrm{s p e e d}$

Substitute known values.

$\setminus \Delta t = \frac{35 \setminus \textrm{m i}}{70 \setminus \frac{\textrm{m i}}{\setminus} \textrm{h}}$

$\setminus \Delta t = 0.5 \setminus \textrm{h}$