Distance = Speed × Time
How far something travels.
Formula
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Example
60 km/h for 2 h = 120 km
How it works
If something moves at a constant speed, every unit of time it covers the same amount of distance. So the total distance is found by multiplying how fast it moves by how long it moves: speed × time. This works because speed tells you the distance covered in 1 unit of time, and time tells you how many of those equal chunks have passed.
When to use it
Use this when an object travels at a steady speed, such as a car on a straight road, a train between stations, or a runner maintaining the same pace. It is especially useful in word problems where you know speed and time and need to find how far something went.
Worked example, step by step
A cyclist rides at 15 km/h for 3 hours. d = s × t Setting in the values: d = 15 × 3 Multiply: d = 45 Final answer: 45 km
Common mistakes to avoid
- Mixing units, such as using speed in km/h but time in minutes without converting first
- Using the formula when the speed is changing instead of staying constant
- Rearranging the formula incorrectly and multiplying the wrong quantities
Did You Know?
Light travels about 300,000 km every second — fast enough to circle Earth 7.5 times in one tick of the clock.
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