Someone answer all of this clearly, I don't get it at all.

Question

Suppose a ship is sailing at a rate of 35km/h parellel to a straight shoreline. The ship is 10km from shore when it passes a lighthouse at 11am.

Question 6 options:

a)
Let k be the distance between the lighthouse and the ship. Let d be the distance from the ship has travelled since 11am. Express k as a function of d. Please include a diagram.


b)
Express d as a function of t, the time elapsed since 11am.


c)
Find k∘d . What does this function represent?