A car travels 170 miles in 7 hours. What is its average speed?
The average speed is 24.285714 mph.
How to work it out
- 1
Write down what you know: distance d = 170 miles, time t = 7 hours. You are asked for the speed v.
- 2
Use the formula speed = distance ÷ time:
- 3
Answer with the unit: 24.285714 mph.
- 4
The same formula rearranged: distance = speed × time (24.285714 × 7 = 170 miles) and time = distance ÷ speed (170 ÷ 24.285714 = 7 hours).
LaTeX source of the formulas on this page
\[ v = \frac{d}{t} = \frac{170}{7} = 24.285714\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{170}{7} = \frac{170}{7} = 24.285714 \]How far at 24.285714 mph
| Time | Distance |
|---|---|
| 0.5 hours | 12.142857 miles |
| 1 hour | 24.285714 miles |
| 2 hours | 48.571429 miles |
| 3 hours | 72.857143 miles |
| 4 hours | 97.142857 miles |
| 5 hours | 121.42857 miles |
Questions
What is the speed if a car travels 170 miles in 7 hours?
The average speed is 24.285714 mph.
How far does it go in 3 hours at that speed?
72.857143 miles.