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JIPMER Jipmer Medical Solved Paper-1998

  • question_answer
    The speed of boat is 5 km/hr in still water. It crosses a river of width of 1 km along a shortest possible path in 15 minutes. Then velocity of the river is:

    A)  1 km/hr       

    B)                                                         2 km/hr              

    C)         3 km/hr  

    D)         4 km/hr

    Correct Answer: C

    Solution :

                    Here: speed of boat in still water \[{{\upsilon }_{b}}\,=5\,\,km/hr\] width of river = 1 km Time taken to cross the river along shortest possible path = 15 min = \[\frac{1}{4}\] hour Hence resultant velocity of the boat \[=4\,km\text{/}hr\] Then the velocity of river \[=\sqrt{{{(5)}^{2}}-{{(4)}^{2}}}=3\,km\text{/}hr\]


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