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Homework Help: Echo problem ?

  1. Sep 8, 2012 #1
    1. The problem statement, all variables and given/known data

    a submarines sends sound waves and receives it after 4 seconds then goes under water 700 m and sends waves and receives it after 3 seconds he wants the depth of water

    2. Relevant equations


    3. The attempt at a solution

    V=d/t V=x/2
    then V=X-700/1.5 so x/2 = x-700/1.5 and X = 2800 is this right ?
  2. jcsd
  3. Sep 8, 2012 #2
    I did not understand you derivation, particularly the V = x/2 part, but the result is correct.
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