A   c h i l d   h e a r s   a n   e c h o   f r o m   a   c l i f f   4   s e c o n d s   a f t e r   t h e   s o u n d   f r o m   a   p o w e r f u l   c r a c k e r   i s   p r o d u c e d .   H o w   f a r   a w a y   i s   t h e   c l i f f   f r o m   t h e   c h i l d ?   G i v e n   t h a t   t h e   s p e e d   o f   s o u n d   i s   340   m / s .

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