A man is observing, from the top of a tower, a boat speeding towards the tower from a certain point 
, with uniform speed. At that point, angle of depression of the boat with the man's eye is 
(Ignore man's height). After sailing for 20 seconds towards the base of the tower (which is at the level of water), the boat has reached a point 
, where the angle of depression is 
. Then the time taken (in seconds) by the boat from 
to reach the base of the tower is:
Text Solution
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Also
put in
'v'speed
time taken to reach
Foot from B
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