Question

    A traveler moves a distance in three intervals. In the first 'u - 15' km, he travels at 20 km/h, in the next 'u' km at 40 km/h, and completes the journey of 'u + 15' km at 30 km/h. If the average speed for the entire trip is 30 km/h, what is 'u'?

    A 10 Correct Answer Incorrect Answer
    B 20 Correct Answer Incorrect Answer
    C 45 Correct Answer Incorrect Answer
    D 15 Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    ATQ, Given:- On solving we get, u = 45

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