1. It spans across Australia, connecting the eastern and western coasts.
2. It is one of the longest railway lines in the world, traversing diverse terrains.
3. It facilitates the movement of goods and passengers across Australia, contributing significantly to economic development.
| List I (Soil Horizon) | List II (Characteristics/Nature) | ||
| A. | A Horizon | I. | Zone of eluviation |
| B. | E Horizon | II. | Unweathered mineral material |
| C. | B Horizon | III. | Surface horizon with mineral material and organic compound beyond recognition |
| D. | C Horizon | IV. | Zone of illuviation |

A ladder of fixed length \( h \) is to be placed along the wall such that it is free to move along the height of the wall.
Based upon the above information, answer the following questions:
(iii) (b) If the foot of the ladder, whose length is 5 m, is being pulled towards the wall such that the rate of decrease of distance \( y \) is \( 2 \, \text{m/s} \), then at what rate is the height on the wall \( x \) increasing when the foot of the ladder is 3 m away from the wall?