A boy on an island is 500 m from some cliffs.
He shouts and he hears an echo from the cliffs.
Sound travels at 340m / s through the air.
What is the time interval between when the boy shouts and when he hears the echo?
1 )
${{500} \over {340}}s$
${{2 \times 500} \over {340}}s$
3 )
${{340} \over {500}}s$
4 )
${{2 \times 340} \over {500}}s$
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