Multiple choice

A moving train $66$ m long overtakes another train $88$ m long moving in the same direction in $0.168$ min. If the second train is moving at $30$ km/hr, at what speed is the first train moving ?

  1. $85$ km/hr
  2. $50$ km/hr
  3. $55$ km/hr
  4. $25$ km/hr
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Relative speed = (66 + 88) m / (0.168 * 60) s = 154 / 10.08 = 15.27 m/s. 15.27 m/s * 3.6 = 55 km/hr. Since they are in the same direction, V1 - V2 = 55. V1 - 30 = 55 => V1 = 85 km/hr.

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