Aptitude - Aptitude- Speed

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 A man rows 13 km upstream in 5 hours and also 28 km downstream in 5 hours. The velpciy of the stream is ?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    speed upstream = (13/5) kmph
    speed downstream (28/5) kmph
    Velocity of stream = (1/2)[(28/5) - (13/5)] = 1.5 kmph

A man rows 750 m in 675 seconds against the stream and returns in 7 and half minutes. His rowing speed in still water is ?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    Rate upstream = (750/675) = 10/9 m/sec
    Rate downstream (750/450) m/sec = 5/3 m/sec.
    Rate in still water = (1/2)*[(10/9) + (5/3)] m/sec. = 25/18 m/sec
    = (25/18)*(18/5) kmPh = 5 kmph

If anshul rows 15 km upstream and 21 km downstream taking 3 hours each time, then the speed of the stream is ?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    Rate upstream = (15/3) kmph
    Rate downstream (21/3) kmph = 7 kmph.
    Speed of stream (1/2)(7 - 5)kmph = 1 kmph.

If a boat goes 7 km upstream in 42 minutes and the speed of the stream is 3 kmph, then the speed of the boat in still water is ?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    Rate upstream = (7/42)*60 kmh = 10 kmph. Speed of stream = 3 kmph.
    Let speed in sttil water is x km/hr
    Then, speed upstream = (x —3) km/hr.
    x-3 = 10 or x = 13 kmph.

 A boat takes 4 hours for travelling downstream from point A to point B aild coming back to point A upstream. If the velocity of the stream is 2 kmph and the speed of the boat in still water is 4 kmph, what is the distance between A and B?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    Let the distance between A and B be x km.
    Speed downstream = 6 kmph, speed upstream = 2 kmph.
    (x/6) + (x/2) = 4 4x = 24 hence x = 6
    Distance AB = 6 km.

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