1. What is Speed?
Speed is a measure of how fast or slow something is moving, usually it is measured in kilometres per hour (km/h) or miles per hour (mph)metres per second (m/s). Speed is calculated by dividing distance by time.
Distance is a measure of length of path. It is usually measured in kilometres (km) or metres (m).
Time is a measure of duration. It is measured in seconds or hours or days or years. For the purpose of solving questions on speed, time and distance we usually use seconds or hours.
These three properties are interlinked together such that if you are given any two of them you can easily calculate the third one.
2. The formula triangle for Speed
The formula triangle for Speed looks like this:
This is the way we use these triangles:-
Where
S → Speed
D → Distance
T → Time
Examples:
1. Charles travels 120 km in 2 hours in his car. Calculate the speed of the car.
2. John is flying in a plane with an average speed of 600 miles per hour. How long does it take for him to reach a runway that is 1200 miles far?
3. A train travels at a speed of 120 kilometres per hour. Calculate the distance covered by the train in 3 hours.
3. What is Average speed?
Average speed is calculated by dividing total distance covered by total time taken to cover the distance.
To find average speed first find out total distance covered then look for total time taken then simply use the formula to solve the question.
Example:
Calculate the average speed of the train which travels 150 km in 2 hours.
