- A50 min
- B40 min
- C30 min
- D60 min
Step-by-Step Solution
First 10 min: 200 L. Remaining 400 L at L/min = 40 min. Total = 50 min. (40 min forgets the first 10.)
Answer: A) 50 min
A pipe pours 20 litres per minute into an empty 600-litre tank. After 10 minutes a crack opens and leaks 10 litres per minute. How long in total does the tank take to fill?
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