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Home Questions & Answers Aptitude Boats & Stream Question Answers In an hour a boat goes 10 Km along the stream and 4 Km against the stream. The speed of the boat in still water (in Kmph) is: 

    In an hour a boat goes 10 Km along the stream and 4 Km against the stream. The speed of the boat in still water (in Kmph) is: 

  • 7 Kmph
  • 8 Kmph
  • 6 Kmph
  • 10 Kmph
  • Explanation:

    speed of stream = X Kmph 
    and the speed of water = 8 Kmph 
    X + Y = 10 
    X - Y = 4 
    X = 7, Y = 3 
    Speed of stream = 7 Kmph