Multiple choice

A train travells at an average speed of $72\ km/hr.$ and acrosses a man standing on platform in $16\ seconds.$ What is the length of the train?

  1. $300\ m$
  2. $320\ m$
  3. $340\ m$
  4. $360\ m$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Convert 72 km/hr to 20 m/s. Since the train takes 16 seconds to pass the stationary man, its length is 20 x 16 = 320 m.

AI explanation

First convert the speed of 72 km/hr to m/s by multiplying by 5/18, which gives 20 m/s. Because the train crosses a stationary man, the distance covered equals the length of the train; use the distance formula (speed times time). Multiplying 20 m/s by 16 s gives a train length of 320 m.

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