If h and h 1 are the heights of a light house and the observer in a ship in metres above M S L then the horizontal distance from the ship to the light house in kilometres is

If h and h 1 are the heights of a light house and the observer in a sh

1.	If h and h 1 are the heights of a light house and the observer in a ship in metres above M S L then the horizontal distance from the ship to the light house in kilometres is
A.	3.86 ( h + h 1 )
B.	3.86 ( h - h 1 )
C.	3.86 ( h x h 1 )
D.	3.86 ? ( h + h 1 )
Answer» B. 3.86 ( h - h 1 )