When sound is produced in an aeroplane moving with a velocity of \(...

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When sound is produced in an aeroplane moving with a velocity of \( 200 \mathrm{~m} / \mathrm{s} \) horizontally its echo is heard after \( 10 \sqrt{5} \)
\( \mathrm{P} \) seconds. If velocity of sound in air is \( 300 \mathrm{~ms}^{-1} \) the elevation

W of aircraft is
[WB-JEE 2008]
(a) \( 250 \mathrm{~m} \)
(b) \( 250 \sqrt{5} m \)
(c) \( 1250 \mathrm{~m} \)
(d) \( 2500 m \)
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