- A60
- B22
- C30
- D50
Step-by-Step Solution
Hole's rate = 1/10 − 1/12 = 6/60 − 5/60 = 1/60 cistern per hour, so it empties a full cistern in 60 hours.
Answer: A) 60
A tap fills a cistern in 10 hours, but because of a hole in the bottom the filling actually takes 12 hours. In how many hours would the hole alone empty a full cistern?
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