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A person standing before a hill blows a horn and heard the echo after 3 seconds. If the velocity of sound is 360 m/s, calculate the distance of the hill from the person

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640m

540 m

240 m

340 m

answer is B.

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Detailed Solution

$\begin{array}{l} t = 3 s \\ v = 360 m / s \\ 2 d = 3 \times 360 \\ d = \frac{3 \times 360}{2} \\ d = 3 \times 180 \\ d = 540 m \end{array}$

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