## 101. The length of the shadow of a vertical tower on level ground increased by 10 m when the altitude of the sum changes from 45° to 30°. The height of the tower is:

## 102. The respective ratio between the height of tower and the point at some distance from its foot is 57 : 19√3. What is the angle (in degrees) of elevation of the top of the tower?

## 103. A balloon leaves from a point P rises at a uniform speed. After 6 minutes, an observer situated at a distance of 450√3 meter from point P observes that angle of elevation of the balloon is 60°. Assume that point of observation and point P are on the same level. What is the speed (in m/s) of the balloon?

## 104. A ladder is placed against a wall such that it just reaches the top of the wall. The foot of the ladder is at a distance of 5 metres from the wall. The angle of elevation of the top of the wall from the base of the ladder is 15°. What is the length (in metres) of the ladder?

## 105. Let A and B be two towers with the same base. From the mid point of the line joining their feet, the angles of elevation of the tops of A and B are 30° and 45° respectively. The ratio of the heights of A and B is:

## 106. From the top of 75 m high tower, the angle of depression of two points P and Q on opposite side of the base of the tower on level ground is $$\theta $$ and $$\phi $$, such that $$\tan \theta = \frac{3}{4}$$ and $$\tan \phi = \frac{5}{8}.$$ What is the distance between the points P and Q?

## 107. A ladder leaning against a wall makes an angle $$\theta $$ with the horizontal ground such that $$\tan \theta = \frac{{12}}{5}.$$ If the height of the top of the ladder from the wall is 24 m, then what is the distance (in m) of the food the ladder from the wall?

## 108. A vertical pole and a vertical tower are on the same level ground in such a way that, from the top of the pole, the angle of elevation of the top of the tower is 60° and the angle of depression of the bottom of the tower is 30°. If the height of the pole is 24 m, then find the height of the tower (in m).

## 109. A pole 23 m long reaches a window which is $$3\sqrt 5 \,{\text{m}}$$ above the ground on one side of a street. Keeping its foot at the same point, the pole is turned to the other side of the street to reach a window $${\text{4}}\sqrt {15} \,{\text{m}}$$ high. What is the width (in m) of the street?

## 110. Exactly midway between the foot of two towers P and Q, the angles of elevation of their tops are 45° and 60°, respectively. The ratio of the heights of P and Q is:

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