A) 90 minutes
B) 10 hours
C) 150 minutes
D) 120 minutes
Correct Answer: B
Solution :
(b): 2 hrs =120 min Let 'C' empty in 'X' minutes Time taken when all are open together = 50. \[\therefore 50=\frac{1}{\frac{1}{120}+\frac{1}{75}-\frac{1}{x}}\] \[\Rightarrow \frac{1}{x}=\frac{1}{120}+\frac{1}{75}=\frac{5+8-12}{600}=\frac{1}{600}\] \[x=600\text{ }min=10hrs.\]You need to login to perform this action.
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