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A stone is dropped from the top of a tower 400 ft high into a lake. How many seconds will it take before the impact sound is heard at the top of the tower?

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A stone is dropped from the top of a tower 400 ft high into a lake. How many seconds will it take before the impact sound is heard at the top of the tower? Answer: 5 seconds

Question context

This question is part of 📏 Arithmetic Aptitude within the broader 🧠 Aptitude Mastery subject and appears in the ASF Airports Security Force preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.