TS Police SI Mains 2016 Solved Paper 3

A man is watching from the top of a tower, a boat speeding away from the tower. The boat makes an angle of depression of 45° with the man’s eye when it is at a distance of 60 m from the tower. After 5 sec, the angle of depression becomes 30°. The approximate speed of the boat, assuming it is running in still water (in kmph) (Take $\sqrt{3}$ = 1.732)