Plz solve this trignometry question.Tomorrow is my exam.

Tomorrow is my maths 1 exam and next day maths 2 exam so plz solve these question whole as soon as possible.

1)As observed from the top of a 100 m tall light house the angles of depression of two ships approaching it are $\displaystyle 30^o$ and $\displaystyle 45^o$. If one ship is directly behind the other, find the distance between the two sips.

2)The angles of elevation of the top of a rock at top and foot of a 100 m high tower are 30^o and 45^o respectively>Find the height of the rock.