Multiple choice

A train $225$ m long is travelling at a uniform speed of $54$ km/hr. How much time will it take to pass a telegraph post ?

  1. $5$ sec
  2. $15$ sec
  3. $20$ sec
  4. $25$ sec
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B Correct answer
Explanation

Convert speed to m/s: 54 km/hr * (5/18) = 15 m/s. Time = distance / speed = 225 / 15 = 15 seconds.

AI explanation

First, convert the train's speed from km/hr to m/s by multiplying by $5/18$, so $54 \times (5/18) = 15$ m/s. To pass a telegraph post, the train covers a distance equal to its own length. Using the formula time = distance / speed, the time is $225 / 15 = 15$ seconds. The result is 15 seconds.

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