A car travels 150 miles in 8 hours. What is its average speed?
The average speed is 18.75 mph.
How to work it out
- 1
Write down what you know: distance d = 150 miles, time t = 8 hours. You are asked for the speed v.
- 2
Use the formula speed = distance ÷ time:
- 3
Answer with the unit: 18.75 mph.
- 4
The same formula rearranged: distance = speed × time (18.75 × 8 = 150 miles) and time = distance ÷ speed (150 ÷ 18.75 = 8 hours).
LaTeX source of the formulas on this page
\[ v = \frac{d}{t} = \frac{150}{8} = 18.75\ \text{mph} \]
\[ v = \frac{d}{t} = \frac{150}{8} = \frac{75}{4} = 18.75 \]How far at 18.75 mph
| Time | Distance |
|---|---|
| 0.5 hours | 9.375 miles |
| 1 hour | 18.75 miles |
| 2 hours | 37.5 miles |
| 3 hours | 56.25 miles |
| 4 hours | 75 miles |
| 5 hours | 93.75 miles |
Questions
What is the speed if a car travels 150 miles in 8 hours?
The average speed is 18.75 mph.
How far does it go in 3 hours at that speed?
56.25 miles.