- A30 min
- B160 min
- C20 min
- D10 min
Step-by-Step Solution
One-quarter of the water needs one-quarter of the time: min. (30 min is the time for three-quarters.)
Answer: D) 10 min
A drain empties the full water cooler of a school canteen in 40 minutes. How long will it take to empty the cooler when it is only one-quarter full?
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