The ratio of speeds of two cars is $4 : 5$. They cover the same distance. The ratio of times they take is:

The ratio of speeds of two cars is $4 : 5$. They cover the same distance. The ratio of times they take is:
  1. $4 : 5$
  2. $5 : 4$
  3. $1 : 1$
  4. $16 : 25$

Solution

For fixed distance, time is inversely proportional to speed: ratio of times $= 5 : 4$.

Asked in: IMO

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