I really need help with this problem, any info on how to solve it will help me, plz

Need help!
The rocks near the shore between two lighthouses at points A and B make the waters unsafe. The measure of arc AXB is 300. Waters inside this arc are unsafe. Suppose you are a navigator on a ship at sea. How can you use the lighthouses to keep the ship in safe waters?

Question

I really need help with this problem, any info on how to solve it will help me, plz 

 
Need help! 
The rocks near the shore between two lighthouses at points A and B make the waters unsafe. The measure of arc AXB is 300. Waters inside this arc are unsafe. Suppose you are a navigator on a ship at sea. How can you use the lighthouses to keep the ship in safe waters?

anonymous · Answer

here is the problem |dw:1337661399607:dw|