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A sound wave travels across a 2,100-meter wide valley in 7.0 seconds. The speed of the wave is _____.
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A sound wave travels across a 2,100-meter wide valley in 7.0 seconds. The speed of the wave is _____.

User Ourjamie
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is the correct answer 300 m/s 
User David Munsa
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300m/s................
User Carlos Pliego
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