Multiple choice

A 225 meters long train ‘P’ passed a pole in 6.75 sec. Train ‘P’ passed an another train ‘Q’ travelling in a direction opposite to ‘P’ in 60/7 sec. If length of train ‘Q’ is 375 meter, then in what time train ‘Q’ will pass train ‘P’ when they both runs in same direction ?

  1. 180 sec

  2. 280 sec

  3. 80 sec

  4. 168 sec

  5. None of These
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Train P speed = 225/6.75 = 100/3 m/s (33.33 m/s). Relative speed opposite direction = (225 + 375)/(60/7) = 600 × 7/60 = 70 m/s. So Q's speed = 70 - 100/3 = 110/3 m/s. Same direction relative speed = 110/3 - 100/3 = 10/3 m/s. Time to pass = (225 + 375)/(10/3) = 600 × 3/10 = 180 sec. Option A is correct.

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