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    Question

    The speed of boat ‘M’ in still water is double the

    speed of boat ‘N’. The two boats are 360 km apart on a river and move towards each other at the same time. If they meet after 6 hours, what is the speed of boat ‘N’ in still water?
    A 18 km/h Correct Answer Incorrect Answer
    B 20 km/h Correct Answer Incorrect Answer
    C 24 km/h Correct Answer Incorrect Answer
    D 10 km/h Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the still water speed of boat ‘N’ = ‘y’ km/h

    Then, still water speed of boat ‘M’ = 2 × y = ‘2y’ km/h

    Let stream speed = ‘x’ km/h

    Effective relative speed = 2y + y = ‘3y’ km/h

    So, 3y = 360 ÷ 6 = 60

    y = 60 ÷ 3 = 20

    Speed of boat ‘N’ in still water = 20 km/h

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