A car travels 220 miles in 7 hours. What is its average speed?
The average speed is 31.428571 mph.
How to work it out
- 1
Write down what you know: distance d = 220 miles, time t = 7 hours. You are asked for the speed v.
- 2
Use the formula speed = distance ÷ time:
- 3
Answer with the unit: 31.428571 mph.
- 4
The same formula rearranged: distance = speed × time (31.428571 × 7 = 220 miles) and time = distance ÷ speed (220 ÷ 31.428571 = 7 hours).
LaTeX source of the formulas on this page
\[ v = \frac{d}{t} = \frac{220}{7} = 31.428571\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{220}{7} = \frac{220}{7} = 31.428571 \]How far at 31.428571 mph
| Time | Distance |
|---|---|
| 0.5 hours | 15.714286 miles |
| 1 hour | 31.428571 miles |
| 2 hours | 62.857143 miles |
| 3 hours | 94.285714 miles |
| 4 hours | 125.71429 miles |
| 5 hours | 157.14286 miles |
Questions
What is the speed if a car travels 220 miles in 7 hours?
The average speed is 31.428571 mph.
How far does it go in 3 hours at that speed?
94.285714 miles.