A car travels 20 miles in 11 hours. What is its average speed?
The average speed is 1.8181818 mph.
How to work it out
- 1
Write down what you know: distance d = 20 miles, time t = 11 hours. You are asked for the speed v.
- 2
Use the formula speed = distance ÷ time:
- 3
Answer with the unit: 1.8181818 mph.
- 4
The same formula rearranged: distance = speed × time (1.8181818 × 11 = 20 miles) and time = distance ÷ speed (20 ÷ 1.8181818 = 11 hours).
LaTeX source of the formulas on this page
\[ v = \frac{d}{t} = \frac{20}{11} = 1.8181818\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{20}{11} = \frac{20}{11} = 1.8181818 \]How far at 1.8181818 mph
| Time | Distance |
|---|---|
| 0.5 hours | 0.90909091 miles |
| 1 hour | 1.8181818 miles |
| 2 hours | 3.6363636 miles |
| 3 hours | 5.4545455 miles |
| 4 hours | 7.2727273 miles |
| 5 hours | 9.0909091 miles |
Questions
What is the speed if a car travels 20 miles in 11 hours?
The average speed is 1.8181818 mph.
How far does it go in 3 hours at that speed?
5.4545455 miles.