There is a boat anchored at A, 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.  what point, C, along the should the first passenger be dropped in order to minimize the distance?  Fill in the blank to answer this question.  The boat would (................) km down the beach la point across from A. (Write your answer to 1 decimal place. Do km down the beach from your answer