(A) A straight highway leads to the foot of a tower. A man standing on the top of the $75 \text{m}$ high tower observes two cars at angles of depression of $30^{\circ}$ and $60^{\circ}$ , which are approaching the foot of the tower. If one car is exactly behind theother on the same side of the tower, find the distance between the two cars. (use $\sqrt{3}=1.73$ ) OR(B) From the top of a $7 \text{m}$ high building, the angle of elevation of the top of a cable tower is $60^{\circ}$ and the angle of depression of its foot is $30^{\circ}$. Determine the height of the tower.