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Boats and Streams - Important Formulas |

  1. Downstream/Upstream:
    In water, the direction along the stream is called downstream. And, the direction against the stream is called upstream.
  2. If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr, then:
    Speed downstream = (u + v) km/hr.
    Speed upstream = (u - v) km/hr.
  3. If the speed downstream is a km/hr and the speed upstream is b km/hr, then:
    Speed in still water =1(a + b) km/hr.
    2
    Rate of stream =1(a - b) km/hr.
    2

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