Question 1170245
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In your post,  in the last question,  you write


        ". . . cross-sectional area 25 metre cube . . . ".



Dear missis or mister writer,  the area is  NEVER  measures in  "metre cube ".  


The appropriate unit for the area is  " square meter ". 



As I noticed from your posts, you make this error systematically.



It tells me a lot about mathematical qualification of a person who created this problem.