A) 110 min
B) 100 min
C) 120 min
D) 90 min
E) 130 min
Correct Answer: B
Solution :
[b] Work done by third pipe in 1 min \[=\,\,\frac{1}{50}-\left( \frac{1}{60}+\frac{1}{75} \right)\] \[=\,\,\left( \frac{1}{50}-\frac{3}{100} \right)=-\frac{1}{100}\] [neglect \[(-ve)\]sing) Therefore, the third pipe alone can empty the cistern in 100 min.You need to login to perform this action.
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