Question 1020144
From the ball, I don't know.
From the boat, the distance to the hotel is the hypotenuse of a right triangle.
The side opposite the angle of elevation is the vertical distance, 70m.
{{{sin(E)=OPP/HYP}}}
{{{sin(10)=70/HYP}}}
{{{HYP=70/sin(10)}}}
{{{HYP=70/0.1736}}}
{{{HYP=403}}}{{{m}}}