When sound is produced in an aeroplane moving With a velocity of 200. m/s horizontally its echo is heard after 10`sqrt 5` seconds. If velocity of sound in air is 300 m`s^-1` the elevation of aeroplane is
A
250 m
B
`250sqrt5`m
C
1250 m
D
2500 m
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The correct Answer is:
D
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