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A sound is made by an aeroplane moving h...

A sound is made by an aeroplane moving horizontally with a speed of 720 km/h. Its echo on reflection from the surface on the earth is heard after 15s. What will be the altitude of the aeroplane if the velocity of sound in air is 1200 km/h?

A

1 km

B

2km

C

4 km

D

8 km

Text Solution

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The correct Answer is:
B
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