JEE Main 2020 Mathematics question

The angle of elevation of the top of a hill from a point on the horizontal plane passing through the foot of the hill is found to be 45º. After walking a distance of 80 meters towards the top, up a slope inclined at an angle of 30º to the horizontal plane, the angle of elevation of the top of the hill becomes 75º. Then the height of the hill (in meters) is