A man standing between two parallel hills fires a gun and hears two ec – McqOptions

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1.	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 \[330\,\,m{{s}^{-1}}\], how long will it take him to hear the third echo? [NDA]
A.	4 s
B.	5 s
C.	6 s
D.	8 s
Answer» D. 8 s

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