A man on the top of a vertical tower observes a car moving at a uniform speed towards the tower on a horizontal road. If it takes 18 min for the angle of depression to change from $3 0^{\circ}$ to $4 5^{\circ}$ : then after this , the time taken (in min) by the car to reach the foot of the tower, is

9 (1 + 3)

18 (1 + 3)

27 (1 + 3)

18 (1 + 9)

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A man on the top of a vertical tower observes a car moving at a uniform speed towards the tower on a horizontal road. If it takes 18 min for the angle of depression to change from

3 0^{\circ}

4 5^{\circ}

: then after this , the time taken (in min) by the car to reach the foot of the tower, is

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Question Text

A man on the top of a vertical tower observes a car moving at a uniform speed towards the tower on a horizontal road. If it takes 18 min for the angle of depression to change from

3 0^{\circ}

4 5^{\circ}

: then after this , the time taken (in min) by the car to reach the foot of the tower, is

A man on the top of a vertical tower observes a car moving at a uniform speed towards the tower on a horizontal road. If it takes 18 min for the angle of depression to change from $3 0^{\circ}$ to $4 5^{\circ}$ : then after this , the time taken (in min) by the car to reach the foot of the tower, is

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