A car travels 300 miles in 5 hours. What is its average speed?

The average speed is 60 mph.

v = \frac{d}{t} = \frac{300}{5} = 60\ \text{mph}

How to work it out

1
Write down what you know: distance d = 300 miles, time t = 5 hours. You are asked for the speed v.
2
Use the formula speed = distance ÷ time:
$v = \frac{d}{t} = \frac{300}{5} = 60$
3
Answer with the unit: 60 mph.
4
The same formula rearranged: distance = speed × time (60 × 5 = 300 miles) and time = distance ÷ speed (300 ÷ 60 = 5 hours).

LaTeX source of the formulas on this page

\[ v = \frac{d}{t} = \frac{300}{5} = 60\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{300}{5} = 60 \]

What is the speed if a car travels 300 miles in 5 hours?

The average speed is 60 mph.

How far does it go in 3 hours at that speed?

180 miles.