question_answer

There is circular plot of land of diameter 24 metres. At the centre of the plot, a pit in the form of a frustum of a cone is dug up. The depth of the pit is 3 meters. The diameters of the top and the bottom of the pit are 4 metres and 2 metres respectively. The earth dug out from the pit is spread uniformly over the remaining area of the plot. Find the height to which the level of the plot rises.

A)  8 cm                           

B)  7cm

C)  6cm                            

D)  5cm

E)  None of these