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    Question

    Speed of current is 25% of speed of boat in still

    water, if boat travelled 45 km downstream and returned back in total 12 hr. then find speed of boat in still water?
    A 4km/hr Correct Answer Incorrect Answer
    B 8km/hr Correct Answer Incorrect Answer
    C 6km/hr Correct Answer Incorrect Answer
    D 10km/hr Correct Answer Incorrect Answer
    E 12km/hr Correct Answer Incorrect Answer

    Solution

    Speed of boat in still water : Speed of current = 100x : 25x => 4x : x According to question, => 45/(4x + x) + 45/(4x – x) = 12 => (135 + 225)/15x = 12 => x = 360/180 = 2 Speed of boat in still water = 4 × 2 = 8 km/hr

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