A car travels 70 miles in 10 hours. What is its average speed?
The average speed is 7 mph.
How to work it out
- 1
Write down what you know: distance d = 70 miles, time t = 10 hours. You are asked for the speed v.
- 2
Use the formula speed = distance ÷ time:
- 3
Answer with the unit: 7 mph.
- 4
The same formula rearranged: distance = speed × time (7 × 10 = 70 miles) and time = distance ÷ speed (70 ÷ 7 = 10 hours).
LaTeX source of the formulas on this page
\[ v = \frac{d}{t} = \frac{70}{10} = 7\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{70}{10} = 7 \]How far at 7 mph
| Time | Distance |
|---|---|
| 0.5 hours | 3.5 miles |
| 1 hour | 7 miles |
| 2 hours | 14 miles |
| 3 hours | 21 miles |
| 4 hours | 28 miles |
| 5 hours | 35 miles |
Questions
What is the speed if a car travels 70 miles in 10 hours?
The average speed is 7 mph.
How far does it go in 3 hours at that speed?
21 miles.