Difficult Trigonometry Word Problem

So the problem goes like this:

From a boat on the water the angle of elevation of the top of a cliff is 31 degrees. From a point 300m closer to the cliff, the angle of elevation is 33 degrees. Find the height of the cliff.

Currently you would not have all the info necessary to solve this equation but I do not know where to go from here.

I don't need the calculated answer so much as I just need a step for step explanation of how to solve it.

Any help is appreciated.

d = distance between the boat and the bottom of the cliff
h = height of the cliff

tan 31 = h/d
tan 33 = h/(d-300)

and then you find h
Use a drawing to understand