Multiple choice

A train running at 25 km/hr takes 18 seconds to pass a platform.Next, it takes 12 seconds to pass a man walking at 5 km/hr in the opposite direction. Find the sum of the length of the train and that of the platform?.

  1. 125 m

  2. 135 m

  3. 145 m

  4. 155 m
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A Correct answer
Explanation

Train speed = 25 km/hr = 25 * (5/18) m/s. Time to pass platform = 18s. Length of train + platform = speed * time = (25 * 5/18) * 18 = 125 m.

AI explanation

Convert the initial train speed of 25 km/hr to metres per second by multiplying by 5/18, yielding 125/18 m/s. The time to pass the platform is 18 seconds, so the sum of the lengths of the train and platform is speed multiplied by time, or 125/18 times 18, resulting in 125 m. This directly gives the required sum without needing to solve for the individual lengths.

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