SATHEE: Quantitative Aptitude Ques 779

Quantitative Aptitude Ques 779

Question: A pipe of diameter d can drain a certain water tank in 40 min. The time taken by a pipe of diameter 2d for doing the same job in

Options:

A) 5 min

B) 10 min

C) 20 min

D) 80 min

Show Answer

Answer:

Correct Answer: B

Solution:

Given, $ t _1=40, $ $ d _1=d, $ $ d _2=2d $ Time $ \propto \frac{1}{Crosssectionareaofpipe} $

$ \Rightarrow $ $ t _1\propto \frac{1}{\frac{\pi }{4}d_1^{2}} $ and $ t _2\propto \frac{1}{\frac{\pi }{4}d_2^{2}} $

$ \Rightarrow $ $ \frac{t _2}{t _1}={{( \frac{d _1}{d _2} )}^{2}} $

$ \therefore $ $ t _2=40{{( \frac{d}{2d} )}^{2}}=10\min $

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Quantitative Aptitude Ques 779

Question: A pipe of diameter d can drain a certain water tank in 40 min. The time taken by a pipe of diameter 2d for doing the same job in

Options:

Answer:

Solution:

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