There are two walls A and B which are 180 m apart from each other. A boy standing at 60 m away from wall A claps his hands once. If the speed of sound in air is \[330\text{ }m\text{ }{{s}^{-1}}\], what is the time interval between the first and the second echo that he hears?

There are two walls A and B which are 180 m apart from each other. A b

1.	There are two walls A and B which are 180 m apart from each other. A boy standing at 60 m away from wall A claps his hands once. If the speed of sound in air is \[330\text{ }m\text{ }{{s}^{-1}}\], what is the time interval between the first and the second echo that he hears?
A.	0.36 s
B.	0.24 s
C.	0.4 s
D.	1 s
Answer» B. 0.24 s

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There are two walls A and B which are 180 m apart from each other. A boy standing at 60 m away from wall A claps his hands once. If the speed of sound in air is \[330\text{ }m\text{ }{{s}^{-1}}\], what is the time interval between the first and the second echo that he hears?

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