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    • Question

      Two trains ‘T4’ and ‘U4’ of lengths 360 metres and

      540 metres respectively are travelling towards each other. Ratio of speed of ‘T4’ to ‘U4’ is 2:3. If the trains take 36 seconds to cross each other from the time they meet, then find the average of speeds (in km/h) of trains ‘T4’ and ‘U4’.
      A 36 km/h Correct Answer Incorrect Answer
      B 40 km/h Correct Answer Incorrect Answer
      C 45 km/h Correct Answer Incorrect Answer
      D 54 km/h Correct Answer Incorrect Answer
      E 60 km/h Correct Answer Incorrect Answer

      Solution

      Let the speed of ‘T4’ and ‘U4’ be ‘2y’ and ‘3y’ m/s respectively.
      Relative speed = 2y + 3y = 5y m/s
      ATQ,
      5y × 36 = 360 + 540
      ⇒ 180y = 900
      ⇒ y = 5
      Therefore, required average = (2y + 3y) ÷ 2 = 2.5y
      = 2.5 × 5 = 12.5 m/s = 12.5 × (18/5) = 45 km/h

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