A car travels 450 miles in 3 hours. What is its average speed?
The average speed is 150 mph.
How to work it out
- 1
Write down what you know: distance d = 450 miles, time t = 3 hours. You are asked for the speed v.
- 2
Use the formula speed = distance ÷ time:
- 3
Answer with the unit: 150 mph.
- 4
The same formula rearranged: distance = speed × time (150 × 3 = 450 miles) and time = distance ÷ speed (450 ÷ 150 = 3 hours).
LaTeX source of the formulas on this page
\[ v = \frac{d}{t} = \frac{450}{3} = 150\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{450}{3} = 150 \]How far at 150 mph
| Time | Distance |
|---|---|
| 0.5 hours | 75 miles |
| 1 hour | 150 miles |
| 2 hours | 300 miles |
| 3 hours | 450 miles |
| 4 hours | 600 miles |
| 5 hours | 750 miles |
Questions
What is the speed if a car travels 450 miles in 3 hours?
The average speed is 150 mph.
How far does it go in 3 hours at that speed?
450 miles.