- A25 min
- B20 min
- C15 min
- D30 min
Step-by-Step Solution
Usual: min. Sunday: min. Extra 15 min. (30 min assumes the leak ran the whole time.)
Answer: C) 15 min
A housing society's 30,000-litre sump is filled by the municipal line at 250 litres per minute. One Sunday a valve leaking 50 litres per minute went unnoticed until the empty sump was half full, and was then fixed. How many minutes longer than usual did the filling take?
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