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SSC Quantitative Aptitude Boats & Streams Question Bank Train and Boat (I)

  • question_answer
    A boat running downstream covers a distance of 10 km in 2 h. While coming back upstream the boat takes 5 h to cover the same distance. If the speed of the current is 1.5 km/h, what is the speed of the boat in still water?

    A) 2.5 km/h

    B) 3.5 km/h

    C) 4.5 km/h

    D) Cannot be determined

    Correct Answer: B

    Solution :

    [b] Speed downstream\[=\frac{10}{2\,km/h}=5\,km/h\] Speed upstream\[=\frac{10}{5\,}\,km/h\] \[=2\,km/h\] Speed of boat in still water \[=\frac{1}{2}(5+2)\,km/h=3.5\,km/h\]


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