A car travels 430 miles in 5 hours. What is its average speed?
The average speed is 86 mph.
How to work it out
- 1
Write down what you know: distance d = 430 miles, time t = 5 hours. You are asked for the speed v.
- 2
Use the formula speed = distance ÷ time:
- 3
Answer with the unit: 86 mph.
- 4
The same formula rearranged: distance = speed × time (86 × 5 = 430 miles) and time = distance ÷ speed (430 ÷ 86 = 5 hours).
LaTeX source of the formulas on this page
\[ v = \frac{d}{t} = \frac{430}{5} = 86\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{430}{5} = 86 \]How far at 86 mph
| Time | Distance |
|---|---|
| 0.5 hours | 43 miles |
| 1 hour | 86 miles |
| 2 hours | 172 miles |
| 3 hours | 258 miles |
| 4 hours | 344 miles |
| 5 hours | 430 miles |
Questions
What is the speed if a car travels 430 miles in 5 hours?
The average speed is 86 mph.
How far does it go in 3 hours at that speed?
258 miles.