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Find the speed of the boat relative to the current

  1. Apr 25, 2013 #1
    edit: woops I messed up the title. It should have been relative to the shore.
    1. The problem statement, all variables and given/known data
    A boat’s speed in still water is 1.95 . The boat is to travel directly across a river whose current has speed 1.10 . Determine the speed of the boat with respect to the shore


    2. Relevant equations
    I'm not sure.


    3. The attempt at a solution
    I thought it would be a sqauared plus b squared is equal to c squared. a being the speed of the boat in still water, b being the current and c being the speed with respect to the shore. This however does not give the right answer
     
    Last edited: Apr 25, 2013
  2. jcsd
  3. Apr 26, 2013 #2

    haruspex

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    When it says 'directly across', I think it means the boat is to finish directly across from where it started. How is that to be achieved?
     
  4. Apr 26, 2013 #3
    boat crossing river

    The boat have to steer at an angle in order go right across the river.
     

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