A car travels 100 miles in 1 hour. What is its average speed?
The average speed is 100 mph.
How to work it out
- 1
Write down what you know: distance d = 100 miles, time t = 1 hour. You are asked for the speed v.
- 2
Use the formula speed = distance ÷ time:
- 3
Answer with the unit: 100 mph.
- 4
The same formula rearranged: distance = speed × time (100 × 1 = 100 miles) and time = distance ÷ speed (100 ÷ 100 = 1 hour).
LaTeX source of the formulas on this page
\[ v = \frac{d}{t} = \frac{100}{1} = 100\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{100}{1} = 100 \]How far at 100 mph
| Time | Distance |
|---|---|
| 0.5 hours | 50 miles |
| 1 hour | 100 miles |
| 2 hours | 200 miles |
| 3 hours | 300 miles |
| 4 hours | 400 miles |
| 5 hours | 500 miles |
Questions
What is the speed if a car travels 100 miles in 1 hour?
The average speed is 100 mph.
How far does it go in 3 hours at that speed?
300 miles.