Question

a car is traveling at a speed of 80 miles per hour. what is the car speed in kilometers per hour? how many kilometer will the car travel in 3 hours, assume that 1 mile is equal to 1.6 kilometers. do not round.

Answer 1

The car is travelling at speed of 80miles per hour.

since it is given that 1 mile=1.6km

To convert 80 miles per hour into kilometer per hour.

multiply 80 by 1.6

$\begin{gathered} 80\text{ miles per hour=80}\times1.6\text{ kilometer per hour} \\ 80\text{ miles per hour=80}\times128\text{ kilometer per hour} \end{gathered}$

128 km per hour.

The expression for the distance is :

$\text{Distance}=\text{speed}\times Time$

For distance at time t=3,

subtitute speed=128km/hr

time=3 hr

$\begin{gathered} \text{Distance}=128\times3 \\ \text{Distance}=384\operatorname{km} \end{gathered}$

The car travel 384km in 3 hours.