1. Two ships are sailing in the sea on the two sides of a lighthouse. The angle of elevation of the top of the lighthouse is observed from the ships are 30º and 45º respectively. If the lighthouse is 100 m high, the distance between the two ships is:
A. 173 m B. 200 m
C. 273 m D. 300 m
A. 173 m B. 200 m
C. 273 m D. 300 m