Multiple choice

A fastmoving superfast express crosses another passenger train in 20 seconds. The speed of faster train is 72 km/hr and speeds of slower train is 27 km/h. Also, the length of faster train is 100 m, then find the length of the slower train if they are moving in the same direction.

  1. 120 metres

  2. 110 metres

  3. 150 metres

  4. 160 metres

  5. 112 metres
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Speeds: 72 km/hr and 27 km/hr in same direction. Relative speed = 72-27 = 45 km/hr = 45×5/18 = 12.5 m/s. Time = 20 seconds. Total distance covered in 20 seconds = 12.5 × 20 = 250 m. This equals sum of both train lengths. Length of slower train = 250 - 100 = 150 m.

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