Volume of cone = (1/3)πr²h, where r = 7 m and h = 24 m. Volume = (1/3) × (22/7) × 7² × 24 = 1232 m³. Rate of pumping = 20 cubic meters per minute. Time taken = Volume / Rate = 1232 / 20 = 61.6 minutes. Correct answer: a) 61.6 minutes
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