The degree at a person or a body moves and covers a particular distance is called the speed (s). The measuring unit of speed is distance per unit time, such as m/s, km/hr, and km/min. For instance, when a person/object covers a distance with a speed of 10 km/hr, it means that the body has moved 10 kilometres in one hour.

Time

The duration over which a person or object has moved is called time (t). The time can be measured in minutes, hours, and seconds depending on the unit used in respect to the speed.

Distance

Distance (d) is the measure of the total area covered by a person or object. It is also known as a scalar quantity. It is measured in units such as meter, kilometre, and centimetre.

Formula for Speed, Time and Distance

When speed is constant, time taken by the object is precisely proportional to the distance covered.

When time is persistent, distance covered is precisely proportional to speed at which the object is moving.

When the distance and continuous speed is inversely relative to the time taken, i.e. if speed increases, the time taken to cover the distance decreases.

If two substances are heading in the similar direction through speeds p and q, then their relative speed is |p – q|

If two substances are heading in the contradictory direction by speeds p and q, then their relative speed is (p + q)

If the speed is given in the form of harmonic progression, then time will be in arithmetic progression.

If the speed is given in arithmetic progression, then the time taken will be harmonic progression.