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JEE Main & Advanced Physics Motion in a Straight Line / सरल रेखा में गति Question Bank Self Evaluation Test - Motion in a Strainght Line

  • question_answer
    A boat takes 2 hours to travel 8 km and back in Still Water Lake. With water velocity of \[4\,\,km\,\,{{h}^{-1}}\], the time taken for going upstream of 8 km and coming back is

    A) 160 minutes

    B) 80 minutes

    C) 100 minutes     

    D) 120 minutes

    Correct Answer: A

    Solution :

    Velocity of boat = \[\frac{8+8}{2}=8\text{ }km{{h}^{-1}}\] Velocity of water \[=4\text{ }k{{m}^{-1}}\] \[t=\frac{8}{8-4}+\frac{8}{8+4}=\frac{8}{3}h=160\text{ minute}\]


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