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An airplane takes off at an angle 30^(@)...

An airplane takes off at an angle `30^(@)` with the horizontal ground treveling at the speed of `180km//h`. If it continuous to fly with the same velocity in the same direction, how long will it take to reach an altitude of `9km` above the ground?

A

5 minutes

B

6 minutes

C

8 minutes

D

9 minutes

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The correct Answer is:
B
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