Multiple choice

The length of Rajdhani train and Passenger train are 200 m and 150 m respectively. They cross each other in 18 seconds. Then find the speed of Passenger train in km/hrs., if the speed of Rajdhani train is 25 km/hrs.

  1. 40 km/hrs.

  2. 30 km/hrs.

  3. 45 km/hrs.

  4. 55 km/hrs.

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Relative speed = (200 + 150)/18 = 350/18 m/s. Rajdhani speed = 25 km/hr = 25×5/18 = 125/18 m/s. Let passenger train speed = v. Then 125/18 + v = 350/18. Solving: v = 225/18 m/s = 225/18 × 18/5 = 45 km/hr.

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