Multiple choice

‘A’, a 320 m long train crosses a pole in 50 seconds, whereas train ‘B’ crosses this pole in 100 seconds. Find the ratio of speed of train ‘A’ to train ‘B’.

  1. $2 : 1$
  2. $4 : 1$
  3. $1 : 2$

  4. None of these

  5. Can’t be determined
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Speed = Distance/Time. For train A, speed = 320/50 = 6.4 m/s. For train B, we only know the time to cross the pole (100 seconds), but we don't know the length of train B. Without the distance information (length of train B), we cannot determine its speed, making the ratio of speeds impossible to calculate.

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