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 at a distance of 60 metres from the tower. After 5'seconds, the angle of depression becomes 30°. What is the approximate speed of the boat, assuming that it is running in still water ?

A) 32 kraph

B) 36 kraph

C) 38 kraph

D) 40 kraph

E) 42 kraph


Option A