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      Question

      Train 'P' travels at a speed of 45 km/h and crosses

      train 'Q' in 15 seconds while moving in opposite directions. Determine the speed of train 'Q' if the lengths of trains 'P' and 'Q' are 120 m and 150 m, respectively.
      A 12.5 km/h Correct Answer Incorrect Answer
      B 18.5 km/h Correct Answer Incorrect Answer
      C 19.8 km/h Correct Answer Incorrect Answer
      D 22.5 km/h Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let the speed of train Q = x km/h According to the question, (45 + x) Γ— 5/18 = (120 + 150)/15 (45 + x) Γ— 5/18 = 18 45 + x = 64.8 x = 19.8 km/h

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