A Double Sound of Hammering.

A spike is hammered into a train rail. You are standing at the other end of the rail. You hear the sound of the hammer strike both through the air and through the rail itself. These sounds arrive at your point six seconds apart. You know that sound travels through air at 1,100 feet per second and through steel at 16,500 feet per second. How far away is that spike? Round your answer to one decimal place.

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