The speeds of 3 cars in the ratio 5:4:6. The ratio between the time taken by them to travel same distance is
Speed = Distance travelled$$\div$$time taken
So, for the same distance travelled, Speed is inversely proportional to time taken.
$$Speed\propto \frac{1}{time taken}$$
Given ratio of speeds of three cars is 5 : 4 : 6.
So, ratio of the time taken to travel same distance is $$\frac{1}{5} : \frac{1}{4} : \frac{1}{6}$$
= 12 : 15 : 10
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