A car travels 20 miles in 3 hours. What is its average speed?
The average speed is 6.6666667 mph.
How to work it out
- 1
Write down what you know: distance d = 20 miles, time t = 3 hours. You are asked for the speed v.
- 2
Use the formula speed = distance ÷ time:
- 3
Answer with the unit: 6.6666667 mph.
- 4
The same formula rearranged: distance = speed × time (6.6666667 × 3 = 20 miles) and time = distance ÷ speed (20 ÷ 6.6666667 = 3 hours).
LaTeX source of the formulas on this page
\[ v = \frac{d}{t} = \frac{20}{3} = 6.6666667\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{20}{3} = \frac{20}{3} = 6.6666667 \]How far at 6.6666667 mph
| Time | Distance |
|---|---|
| 0.5 hours | 3.3333333 miles |
| 1 hour | 6.6666667 miles |
| 2 hours | 13.333333 miles |
| 3 hours | 20 miles |
| 4 hours | 26.666667 miles |
| 5 hours | 33.333333 miles |
Questions
What is the speed if a car travels 20 miles in 3 hours?
The average speed is 6.6666667 mph.
How far does it go in 3 hours at that speed?
20 miles.