A car travels 250 miles in 9 hours. What is its average speed?
The average speed is 27.777778 mph.
How to work it out
- 1
Write down what you know: distance d = 250 miles, time t = 9 hours. You are asked for the speed v.
- 2
Use the formula speed = distance ÷ time:
- 3
Answer with the unit: 27.777778 mph.
- 4
The same formula rearranged: distance = speed × time (27.777778 × 9 = 250 miles) and time = distance ÷ speed (250 ÷ 27.777778 = 9 hours).
LaTeX source of the formulas on this page
\[ v = \frac{d}{t} = \frac{250}{9} = 27.777778\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{250}{9} = \frac{250}{9} = 27.777778 \]How far at 27.777778 mph
| Time | Distance |
|---|---|
| 0.5 hours | 13.888889 miles |
| 1 hour | 27.777778 miles |
| 2 hours | 55.555556 miles |
| 3 hours | 83.333333 miles |
| 4 hours | 111.11111 miles |
| 5 hours | 138.88889 miles |
Questions
What is the speed if a car travels 250 miles in 9 hours?
The average speed is 27.777778 mph.
How far does it go in 3 hours at that speed?
83.333333 miles.