A person rings a metallic bell near a strong concrete wall. He hears the echo after 0. 3.s. If the sound moves with a speed of 340 m/s, how far is the wall from him?

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Q: 49 (CDS-I/2016)
A person rings a metallic bell near a strong concrete wall. He hears the echo after 0.
3.s. If the sound moves with a speed of 340 m/s, how far is the wall from him?
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question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,18,46,21,18,18,7

keywords: 

{'metallic bell': [0, 0, 0, 1], 'echo': [0, 0, 1, 2], 'speed': [0, 1, 2, 0], 'wall': [1, 0, 2, 3], 'strong concrete wall': [0, 0, 0, 1]}