The radius of a cylindrical cistern is 10 metres and its height is 15 metres. In

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The radius of a cylindrical cistern is 10 metres and its height is 15 metres. Initially the cistern is empty. We start filling the cistern with water through a pipe whose diameter is 50 cm. Water is coming out of the pipe with a velocity of 5 m/sec. How many minutes will it take in filling the cistern with water ?

Options:

A . 20 min

B . 40 min

C . 60 min

D . 80 min

Answer: Option D

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