A car travels 250 miles in 12 hours. What is its average speed?
The average speed is 20.833333 mph.
How to work it out
- 1
Write down what you know: distance d = 250 miles, time t = 12 hours. You are asked for the speed v.
- 2
Use the formula speed = distance ÷ time:
- 3
Answer with the unit: 20.833333 mph.
- 4
The same formula rearranged: distance = speed × time (20.833333 × 12 = 250 miles) and time = distance ÷ speed (250 ÷ 20.833333 = 12 hours).
LaTeX source of the formulas on this page
\[ v = \frac{d}{t} = \frac{250}{12} = 20.833333\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{250}{12} = \frac{125}{6} = 20.833333 \]How far at 20.833333 mph
| Time | Distance |
|---|---|
| 0.5 hours | 10.416667 miles |
| 1 hour | 20.833333 miles |
| 2 hours | 41.666667 miles |
| 3 hours | 62.5 miles |
| 4 hours | 83.333333 miles |
| 5 hours | 104.16667 miles |
Questions
What is the speed if a car travels 250 miles in 12 hours?
The average speed is 20.833333 mph.
How far does it go in 3 hours at that speed?
62.5 miles.