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A plane is going in circles around an ai...

A plane is going in circles around an airport. The plane takes 3 minutes to complete one round. The angle of elevation of the plane from a point P on the ground at time t seconds is equal to that at time (t + 30) seconds. At time (t + x) seconds, the plane mes vertically above the point P. What is x equal to ?

A

75 seconds

B

90 seconds

C

105 seconds

D

135 seconds

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