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?

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Q: 4 (NDA-I/2008)
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?
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,9,16,4,11,9,1

keywords: 

{'third echo': [0, 0, 1, 0], 'velocity': [0, 2, 2, 6], 'echoes': [0, 0, 1, 0], 'sound': [4, 3, 10, 15], 'parallel hills': [0, 0, 1, 0], 'firing': [0, 0, 1, 0], 'gun': [0, 1, 1, 1]}