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**calculus...no clue :(**

Here is this question, I have no clue how to do it, I have tried it several different ways but cannot manage to get the right answer. Any help will be appreciated.

There is a 4 km long straight beach. At one end, there is a boat anchored at A, 3 km off the beach. At the other end, there is another boat anchored at B, 5 km off the beach. A sailor from the first boat is to bring a passenger to the beach and proceed to the second boat to pick up another passenger. At what point, C, along the beach should the first passenger be dropped in order to minimize the distance? Fill in the blank to answer this question. The boat whould land _______ km down the beach from a point across from A.

The answer is 1.50