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    Question

    Two boats A and B start towards each other from two

    places,108km apart. The speeds of boats A and B in still water are 12km/h and 15km/h respectively. if A proceeds down and B up the stream, they will meet after.
    A 7h Correct Answer Incorrect Answer
    B 3h Correct Answer Incorrect Answer
    C 4h Correct Answer Incorrect Answer
    D 9h Correct Answer Incorrect Answer

    Solution

    Let the speed of stream =y km/h Since boat A is moving downstream with 12km/h. Speed of boat A =12+y Since boat is moving upstream with 15km/h – Speed of boat B=15-y Both the boats are moving in opposite directions- Relative Speed of boat A and B=12+y+15-y =27km/h Time = D/relative speed =108/27=4hours

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