Question

Traveling by car, Kate covered $120$ miles in $4$ hours. At what speed (miles per hour) was she driving?

• A. $40mi$ per $h$
• B. $30mi$ per $h$
• C. $48mi$ per $h$
• D. $35mi$ per $h$

Answer 1

The correct option is B $30mi$ per $h$

Distance covered by Kate $=120mi$
Time taken $=4h$

Unit rate = distance covered in unit time $=\frac{\text{distance covered}}{\text{time taken}}$

Here, the unit rate is called speed.
So, the speed at which Kate was driving $=\frac{120}{4}=30\text{mi per h}$