Posted by **Alina** on Monday, October 11, 2010 at 11:57am.

A mine shaft is known to be 57.8 m deep. If you would drop a rock down the shaft, how long would it take for you to hear the sound of the rock hitting the bottom of the shaft knowing that sound travels at a constant velocity of 345 m/s?

The answer is 3.60s, but I need to work out. Please help!

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