Question

A man at top of a vertical observation tower observes a car moving at uniform speed coming directly towards the tower. If it takes 12 minutes for angle of depression to change from 30 degree to 60 degree, how much after this will the car reach the observation tower? ALL I NEED IS THE LAST ANSWER.....the method is not necessary

Answer 1

Answer:

i think it is 10 minutes,

BTW ask on quora

Answer 2

6 minutes it will take