Answer:
274.4 meters
Step-by-step explanation:
As speed = distance/time, we can customize this formula to speed = distance*2/time, as its and echo it travels to the object and comes back to the place where the sound came from travelling that distance twice.
So, speed = distance*2/time
343 = 2x/1.6
343*1.6= 2x
548.8= 2x
x = 274.4 meters