A car travels 50 miles in 7 hours. What is its average speed?
The average speed is 7.1428571 mph.
How to work it out
- 1
Write down what you know: distance d = 50 miles, time t = 7 hours. You are asked for the speed v.
- 2
Use the formula speed = distance ÷ time:
- 3
Answer with the unit: 7.1428571 mph.
- 4
The same formula rearranged: distance = speed × time (7.1428571 × 7 = 50 miles) and time = distance ÷ speed (50 ÷ 7.1428571 = 7 hours).
LaTeX source of the formulas on this page
\[ v = \frac{d}{t} = \frac{50}{7} = 7.1428571\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{50}{7} = \frac{50}{7} = 7.1428571 \]How far at 7.1428571 mph
| Time | Distance |
|---|---|
| 0.5 hours | 3.5714286 miles |
| 1 hour | 7.1428571 miles |
| 2 hours | 14.285714 miles |
| 3 hours | 21.428571 miles |
| 4 hours | 28.571429 miles |
| 5 hours | 35.714286 miles |
Questions
What is the speed if a car travels 50 miles in 7 hours?
The average speed is 7.1428571 mph.
How far does it go in 3 hours at that speed?
21.428571 miles.