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  • Question
  • Rajesh rows in still water with a speed of 4.5 kmph to go to a certain place and comes back. Find his average speed for the whole journey, if the river is flowing with a speed of 1.5 kmph?


  • Options
  • A. 2 kmph
  • B. 4 kmph
  • C. 6 kmph
  • D. 8 kmph

  • Correct Answer
  • 4 kmph 

    Explanation

    Let the distance in one direction = k kms

    Speed in still water = 4.5 kmph

    Speed of river = 1.5

    Hence, speed in upstream = 4.5 - 1.5 = 3 kmph

    Speed in downstream = 4.5 + 1.5 = 6 kmph

    Time taken by Rajesh to row upwards = k/3 hrs

    Time taken by Rajesh to row downwards = k/6 hrs

    Now, required Average speed = Total   distance Total   speed   =   2 k k 3   +   k 6   =   2 k   x   18 6 k   +   3 k   =   4   kmph  

     

    Therefore, the average speed of the whole journey = 4kmph.

  • Tags: AIEEE, Bank Exams, CAT, GATE, GRE, Analyst, Bank Clerk, Bank PO, Database Administrator

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