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JEE Main & Advanced Sample Paper JEE Main Sample Paper-6

  • question_answer
    A man can swim with a speed of 4 km/h in still water. How long does it take to cross a river 1 km wide, if the river flows steadily at 3 km/h and he makes his strokes normal to the river current? How far down the river does he go when he reaches the other bank?

    A)  1/3 h, 1 km        

    B)  1/4 h, 4/3 km

    C)  1/3 h, 3/4 km  

    D)  1/4 h, 3/4 km

    Correct Answer: D

    Solution :

    Along the normal to river current, time taken to cross the river\[t=\frac{1}{4}h=15\min \] Distance covered along the current. \[x=3\times \frac{1}{4}km=750m\]


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