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If the time taken in an echo is 5 seconds, which among the following will be the approximate distance of the object from source of

If the time taken in an echo is 5 seconds, which among the following will be the approximate distance of the object from source of sound? (assume normal room temperature at 20°C)

(A) 1715 meters (B) 1256 meters (C) 857 meters (D) 554 meters

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