A man on the top of a tower observes a truck at an angle of depression  'a',where  tan a =1/ root 5

and sees that it is moving towards the base of the tower . Ten mins later ,the angle of depression of the is found to be 'b' where tan b= root 5  .Assuming that the truck moves at a uniform speed ,determine how much more time it will take to reach the base of the tower ??

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any one post the soluion please....

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