A car travels 140 miles in 10 hours. What is its average speed?
The average speed is 14 mph.
How to work it out
- 1
Write down what you know: distance d = 140 miles, time t = 10 hours. You are asked for the speed v.
- 2
Use the formula speed = distance ÷ time:
- 3
Answer with the unit: 14 mph.
- 4
The same formula rearranged: distance = speed × time (14 × 10 = 140 miles) and time = distance ÷ speed (140 ÷ 14 = 10 hours).
LaTeX source of the formulas on this page
\[ v = \frac{d}{t} = \frac{140}{10} = 14\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{140}{10} = 14 \]How far at 14 mph
| Time | Distance |
|---|---|
| 0.5 hours | 7 miles |
| 1 hour | 14 miles |
| 2 hours | 28 miles |
| 3 hours | 42 miles |
| 4 hours | 56 miles |
| 5 hours | 70 miles |
Questions
What is the speed if a car travels 140 miles in 10 hours?
The average speed is 14 mph.
How far does it go in 3 hours at that speed?
42 miles.