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Answer : 1 541 times Explanation : Answer: A) 541 times Explanation: There are 60 minutes in an hour.In ¾ of an hour there are (60 × ¾) minutes = 45 minutes.In ¾ of an hour there are (60 × 45) seconds = 2700 seconds.Siren sounds for every 5 seconds.In 2700 seconds = 2700/5 = 540 times.The count start after the first sound, the Siren will sound 541 times in ¾ of an hour.

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