Mathematics for IGCSE & O level - Proportion (Section 2 - No. 25)
A car travels at a speed of *s* km/h and takes *t* hours to cover a certain distance. Which of the following statements are true if the distance is constant?
Speed and time are inversely proportional.
Speed and time are directly proportional.
If the speed increases, the time decreases.
If the speed decreases, the time increases.
Giải thích
Distance = speed × time. If the distance is constant, speed and time must be inversely proportional. So, if the speed goes up, the time goes down and vice versa.