Speed, distance and time are related to each other because, speed is directly comparable to distance when time is constant.

If we want to calculate the speed of an object we have to know how far that object has travelled and how much time it took to get there. Speed is the rate of change of distance with time. Speed and velocity are associated in a similar manner like distance and displacement are associated. Speed is scalar where as velocity is vector. Displacement is calculated along the straight path amid the two points and hence its magnitude is generally less than or identical to the distance.

The scale of the displacement reaches the distance as distance touches zero. This means that distance as well as displacement is proportionately the same when the distance inspected is "small".

If we want to calculate the speed of an object we have to know how far that object has travelled and how much time it took to get there. Speed is the rate of change of distance with time. Speed and velocity are associated in a similar manner like distance and displacement are associated. Speed is scalar where as velocity is vector. Displacement is calculated along the straight path amid the two points and hence its magnitude is generally less than or identical to the distance.

The scale of the displacement reaches the distance as distance touches zero. This means that distance as well as displacement is proportionately the same when the distance inspected is "small".