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ANIRUDH

· started a discussion

· 1 Months ago

wrong explanation (probably wrong answer) (Question: 388298.0 )

surface area total or curved ----not specified
then pi r^2 is area of circle not of cone so how could you use pi r^2=4 pi
then h=4/3 and you are using 10/3
were you in sleep while preparing the solution
clear the doubts

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)

  

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