1.

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 minutes from the angle of depression of the car to change from 30^(@) "to" 45^(@), then after this, the time taken (in minutes) by the car to reach the foot of the tower, is

Answer»

`9 (1 + SQRT(3))`
`18 (sqrt(3) - 1)`
`(9)/(2) (sqrt(3) - 1)`
`18 (1 + sqrt(3)`

ANSWER :A


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