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prakash deep

· started a discussion

· 1 Months ago

Foolish explanation (Question: 388298.0 )

Never expected such a baseless solution atleast from Topranks;
you are such a dumd that u dont even know basic formula of surface area or u just want to confuse us in such a brink of exam....on what basis u had taken surfacr area=base area=4pi

learn it : surface area of cone= lateral surface area + base area...but u had not taken lateral area

Question:

An inverted right circular cone has a radius of 5 cm. This cone is partly filled with oil which is dipping from a hole in the tip at the rate of π/3 cm3/hour. Currently the level of oil is 2 cm. from top and base area of oil is 4 π cm2. How long will it take the cone to be completely empty  –  

Options:
A)

100 hrs.

B)

\({250\over 3}\)  hrs.

C)

\({250\pi \over 3}\)   hrs.

D)

100π hrs.

Solution:

Ans: (b)

  

Sunil Vasu

· commented

· 1 Months ago

ya dats correct

mrinal shastry

· commented

· 1 Months ago

yhn oil surface ki baat h na ki cone ke surface ki
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