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    Question

    A boat covers 24km upstream and 36km downstream in 6

    hours while it covers 36km upstream and 24km downstream in 13/2 hours. The speed of the Boat is. 
    A 10km/h Correct Answer Incorrect Answer
    B 30km/h Correct Answer Incorrect Answer
    C 20km/h Correct Answer Incorrect Answer
    D 15km/h Correct Answer Incorrect Answer

    Solution

    Let the speed of boat in still water =B and speed of stream =S ATQ- In these types of questions, make factor of 24 and 36 and choose the common values which satisfy the above equations. 24=2,3,4,6,8,12 36=3,4,6,9,12,18 Choose the greatest common factor. Put this value in equation (1) B-S=8 B+S=12 B=10, S=2 Speed of Boat=10km/h.

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