A car travels 40 miles in 9 hours. What is its average speed?
The average speed is 4.4444444 mph.
How to work it out
- 1
Write down what you know: distance d = 40 miles, time t = 9 hours. You are asked for the speed v.
- 2
Use the formula speed = distance ÷ time:
- 3
Answer with the unit: 4.4444444 mph.
- 4
The same formula rearranged: distance = speed × time (4.4444444 × 9 = 40 miles) and time = distance ÷ speed (40 ÷ 4.4444444 = 9 hours).
LaTeX source of the formulas on this page
\[ v = \frac{d}{t} = \frac{40}{9} = 4.4444444\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{40}{9} = \frac{40}{9} = 4.4444444 \]How far at 4.4444444 mph
| Time | Distance |
|---|---|
| 0.5 hours | 2.2222222 miles |
| 1 hour | 4.4444444 miles |
| 2 hours | 8.8888889 miles |
| 3 hours | 13.333333 miles |
| 4 hours | 17.777778 miles |
| 5 hours | 22.222222 miles |
Questions
What is the speed if a car travels 40 miles in 9 hours?
The average speed is 4.4444444 mph.
How far does it go in 3 hours at that speed?
13.333333 miles.