Mathematics for IGCSE & O level - Proportion (Section 2 - No. 23)

If the time taken (*t*) to travel a distance is inversely proportional to the speed (*s*), which of the following statements is true?

t*s = k

t/s = k

t = k/s

s=k/t

Inverse proportion means that the product of two variables is a constant, or the variables can be expressed as y = k/x