A car travels 170 miles in 10 hours. What is its average speed?
The average speed is 17 mph.
How to work it out
- 1
Write down what you know: distance d = 170 miles, time t = 10 hours. You are asked for the speed v.
- 2
Use the formula speed = distance ÷ time:
- 3
Answer with the unit: 17 mph.
- 4
The same formula rearranged: distance = speed × time (17 × 10 = 170 miles) and time = distance ÷ speed (170 ÷ 17 = 10 hours).
LaTeX source of the formulas on this page
\[ v = \frac{d}{t} = \frac{170}{10} = 17\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{170}{10} = 17 \]How far at 17 mph
| Time | Distance |
|---|---|
| 0.5 hours | 8.5 miles |
| 1 hour | 17 miles |
| 2 hours | 34 miles |
| 3 hours | 51 miles |
| 4 hours | 68 miles |
| 5 hours | 85 miles |
Questions
What is the speed if a car travels 170 miles in 10 hours?
The average speed is 17 mph.
How far does it go in 3 hours at that speed?
51 miles.