From the top of height y m the angle of depression of a Channel swimmer at X is 30°. She swims directly towards the base of the cliff such that 1 minute later, at Y, the angle of depression from the top of the cliff to the swimmer is 50°. Given that her speed between X and Y is 0.75m/s, find the height of the cliff.

Answer 1

.75m/s * 60s = 45m

Draw a diagram. It will show that

y cot 30° - y cot 50° = 45

Answer 2

I want to know this question