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      Question

      A boy standing on a hill hears the echo of a shot from a

      nearby cliff located 2.5 km away, after 28 seconds. Determine the approximate speed at which sound travelled.
      A 55 m/s Correct Answer Incorrect Answer
      B 89 m/s Correct Answer Incorrect Answer
      C 63 m/s Correct Answer Incorrect Answer
      D 90 m/s Correct Answer Incorrect Answer

      Solution

      ATQ,

      Speed of sound

      = (2.5 ร— 1000) / 28

      = 2500 / 28

      โ‰ˆ 89.29 m/s or 89 approximately

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