Multiple choice

A train is running at a speed of 48 km/hr. A passenger counts the telephone posts along the line as he passes them. If the posts are 50 m apart, then how many posts will he cross per minute?

  1. 16

  2. 20

  3. 24

  4. 10

  5. 12
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A Correct answer
Explanation

Speed = 48 km/hr = 48000 m / 60 min = 800 m/min. Posts are 50m apart. Number of gaps = 800/50 = 16. Number of posts = 16 + 1 = 17. However, usually, in such problems, we count the intervals or the question implies 16.

AI explanation

The train travels at 48 km/hr, which converts to 48 multiplied by (5 divided by 18), equaling 40 divided by 3 metres per second. In one minute, which is 60 seconds, the train covers a distance of (40 divided by 3) multiplied by 60, giving 800 metres. Since the posts are 50 metres apart, the train passes 800 divided by 50 intervals, which is 16 intervals, meaning the passenger counts 16 posts.

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