- A14
- B40.5
- C45
- D12
Step-by-Step Solution
Combined rate = 1/18 + 1/63 = (7 + 2)/126 = 1/14 per hour, so the time is 14 hours.
Answer: A) 14
A housing society in Nagpur has two inlet pipes for its sump. One fills the empty sump in 18 hours and the other in 63 hours. With both running, how many hours does the filling take?
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