Multiple choice

What is the speed of the train? I. Train passed a pillar in 18 sec. II. Train passed a platform of equal length in 36 sec. III. The length of train is 300m.

  1. Any two

  2. III and I or II

  3. I and II or III

  4. All three together are sufficient

  5. All three together are not sufficient
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Speed = Distance/Time. From II: Train passes platform of equal length (300m) in 36 seconds, so total distance = 600m. Speed = 600/36. From I+III: Train length = 300m, passes pillar in 18 seconds, so speed = 300/18. Check: 300/18 = 16.67 m/s. 600/36 = 16.67 m/s - consistent. So I+III or II+III gives speed. Option B (III and I or II) is correct. I+II alone doesn't work because we don't know the length.

Keep practicing — related questions