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    Question

    Two trains running towards each other on parallel

    tracks, at speeds of 45 km/hr and 51 km/hr, take 21 seconds to cross each other. If the length of one train is 290 m, then the length (in m) of the other train is:
    A 250 Correct Answer Incorrect Answer
    B 230 Correct Answer Incorrect Answer
    C 290 Correct Answer Incorrect Answer
    D 270 Correct Answer Incorrect Answer

    Solution

    Given: Speed₁ = 45 km/h Speed₂ = 51 km/h Time = 21 sec Length of one train = 290 m Relative speed (opposite directions) = 45 + 51 = 96 km/h Convert to m/s: = 96 × (5/18) = 26.67 m/s Total distance covered in 21 sec = 26.67 × 21 = 560.07 m Length of second train = Total − 290 = 560.07 − 290 = 270.07 ≈ 270 m

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