A car travels 430 miles in 9 hours. What is its average speed?
The average speed is 47.777778 mph.
How to work it out
- 1
Write down what you know: distance d = 430 miles, time t = 9 hours. You are asked for the speed v.
- 2
Use the formula speed = distance ÷ time:
- 3
Answer with the unit: 47.777778 mph.
- 4
The same formula rearranged: distance = speed × time (47.777778 × 9 = 430 miles) and time = distance ÷ speed (430 ÷ 47.777778 = 9 hours).
LaTeX source of the formulas on this page
\[ v = \frac{d}{t} = \frac{430}{9} = 47.777778\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{430}{9} = \frac{430}{9} = 47.777778 \]How far at 47.777778 mph
| Time | Distance |
|---|---|
| 0.5 hours | 23.888889 miles |
| 1 hour | 47.777778 miles |
| 2 hours | 95.555556 miles |
| 3 hours | 143.33333 miles |
| 4 hours | 191.11111 miles |
| 5 hours | 238.88889 miles |
Questions
What is the speed if a car travels 430 miles in 9 hours?
The average speed is 47.777778 mph.
How far does it go in 3 hours at that speed?
143.33333 miles.