If a man walks at $5$ km/h, he covers a certain distance in $36$ minutes. If he walks at $4$ km/h, he will…

If a man walks at $5$ km/h, he covers a certain distance in $36$ minutes. If he walks at $4$ km/h, he will take:
  1. $40$ min
  2. $42$ min
  3. $45$ min
  4. $48$ min

Solution

$5 \times 36 = 4 \times t \Rightarrow t = 45$ min.

Asked in: IMO

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