Question

please solve this. as soon as as possible

Answer 1

h(AB)=75m  
let distance between two ships be x( DC)and the distance of second  ship from lighthouse be y(BC)
in triangle ABC,
tan45=75/y
y=75

in triangle ABD
tan30=75/x+y
1/root3=75/x+75


x+75=75root3
x=75(1-root3)

Answer 2

Here is your answerSee the PIC you'll get your answer