Submitted by examrobotsa on Thu, 01/01/1970 - 05:30 A man standing between two parallel hills fires a gun and hears two echoes, one 2.5 s and the other 3.5 s after the firing. If the velocity of sound is 330 ms-1, how long will it take him to hear the third echo?4 s 5 s6 s8 sstats: 0,104,232,88,128,104,16