Question

    Two trains A and B started from a point and running

    perpendicularly. if the speed of train A and train B is 3.5 km/hr and 12 km/hr respectively, find the distance between them after 2 hours.
    A 22 km Correct Answer Incorrect Answer
    B 23 km Correct Answer Incorrect Answer
    C 25 km Correct Answer Incorrect Answer
    D 20 km Correct Answer Incorrect Answer

    Solution

    Speed1 = 3.5 km/h Speed2 = 12 km/h Distance, d1 = 3.5 × 2 = 7 km Distance, d2 = 12 × 2 = 24 km As, both are running perpendicularly Hence, the required distance = √(d12 + d22) = √(72  + 242 ) = √(49 + 576) = √625 = 25 km

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