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A tap having diameter 'd' an empty a tank in 40 min. How long another tap having diameter '2d' take to empty the same tank?
A) 5 min
B) 29 min
C) 10 min
D) 40 min
Correct answer:
C) 10 min
Description for Correct answer:
Area of tap ... Work done by pipe. When diameter is doubled, area will be four times. So, it will work four times faster.
Hence, required time taken to empty the tank = \( \Large 40 \times \frac{1}{4} \) = 10 min.
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