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Railways Sample Paper RRB (Group D) Sample Test Paper-14

  • question_answer
    A ship is moving at a speed of 30 km/hr. To know the depth of the ocean beneath it, it sends a radiowave which travels at a speed 200 m/s. The ship receives the signal after it has moved 500 m. The depth of the ocean is

    A)  6 km               

    B)  12 km

    C)  \[\sqrt{6}\,\,m\]            

    D)  8 km

    Correct Answer: B

    Solution :

    [b] Speed=30 km/h=\[30\times \frac{5}{18}=\frac{25}{3}\,\,m/s\] Distance covered by ship = 500 m \[Time=\frac{500\times 3}{25}=60\,\sec \] Distance covered by wave\[=60\times 200=12000\,\,m\] Depth of sea =\[\frac{12000}{1000}=12\,\,km\]


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