Consider the formula \(\text{Speed} = \frac{\text{Distance Travelled}}{\text{Time Taken}}\). If we want to measure the instantaneous speed, we shouldn't wait too long to measure it. In other words, we should choose as low a value for Time as possible.

Of course, we can't choose the value of Time to be \(0\)! Because we cannot divide any number by \(0\). But, the closer the value of \(\text{Time}\) to \(0\), the more instantaneous the value of speed.