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    Question

    A boat running downstream covers a distance of 45 km in

    3 hrs while it covers the same distance upstream in 5 hrs. Then speed of the boat in still water is
    A 24 km/hr Correct Answer Incorrect Answer
    B 9 km/hr Correct Answer Incorrect Answer
    C 12 km/hr Correct Answer Incorrect Answer
    D 15 km/hr Correct Answer Incorrect Answer

    Solution

    Let the speed of boat in still water be a km/hr and that of stream be b km/hr. Therefore, 45/(a + b)= 3 тЗТ a + b = 15 тАжтАжтАж..(i) 45/(a тАУ b)= 5 тЗТ a + b = 9 тАжтАжтАж..(ii) On adding, eq (i) and (ii) тЗТ 2a = 24 km/hr тЗТ a = 12 km/hr

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