Seismic exploration identifies underground phenomena, such as caves, oil pockets, and rock layers, by transmitting sound into the earth and timing the echo of the vibration. From a sounding at point A, a "thumper" truck locates an underground chamber 7 km away. Moving to point B, 5 km from point A, the truck takes a second sounding and finds the chamber is 3 km away from that point. Assume that the underground chamber lies in the same vertical plane as A and B. What more can you say about the location of the underground chamber?

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3 km