Question 1161004
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I just answered you yesterday, saying 


<pre>
    There is no such a notion/conception as a "perpendicular depth".


    There is a notion/conception "depth", instead, as one single word.


    Its meaning is the distance from the calm water surface to the bottom, measured vertically down.
</pre>


Can you read and understand the meaning of my words ?



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Comment from student: Sorry but that is not the answer I’m looking for. I’ not asking for a meaning. 
I’m asking for a calculation. You just gave me the meaning and not the calculations for the answer. 
Let’s just say that perpendicular depth is wrong. But my point is how do you get the answer by basing on the given numbers.
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<U>My responce</U> :  Just write your post correctly.


That's all.