A) 8 min
B) \[13\frac{1}{3}\]min
C) 30 min
D) 38 min
Correct Answer: B
Solution :
[b] A pipe with double diameter will take half-time. So, the second pipe can empty the full tank in 20 min. Part emptied by both in 1 min \[=\left( \frac{1}{40}+\frac{1}{20} \right)=\frac{3}{40}\] Time taken to empty the full tank \[=\frac{40}{3}\min =13\frac{1}{3}\min \] |
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