A right conical circular vessel is being filled with green industrial waste at a rate of 200 cubic meters per second. How fast is the level rising after  cubic meters have been poured in? (The cone has height 75 m and radius 45 m at its brim. The volume of a cone of height h and cross-sectional radius r at its brim is given by

style="vertical-align:middle;" />.) Round your answer to the one decimal place.

?



A.
B.
C.
D.
E.


Answer: E

Mathematics

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Mathematics