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How Far is the Speaker from Each Observer?

A loudspeaker is placed between two observers who are 120m apart along the line connecting them. If one observer records a sound level of 60dB and the other records a sound level of 90dB, how far is the speaker from each observer?

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The solution contains formatted calculations and explanation attached in two files. The files are identical in content, only differ in format. The first is in MS Word XP Format, while the other is in Adobe pdf format. Therefore you can choose the format that is most suitable to you.