A car running at $50$ km/h covers a distance in $9$ hours. At what speed must it run to cover the same…

A car running at $50$ km/h covers a distance in $9$ hours. At what speed must it run to cover the same distance in $6$ hours?
  1. $60$ km/h
  2. $65$ km/h
  3. $70$ km/h
  4. $75$ km/h

Solution

Speed $\times$ time constant: $50 \times 9 = s \times 6 \Rightarrow s = 75$ km/h.

Asked in: IMO

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