When arranging the copper mines of Rajasthan from north to south, the correct order is:
- Khetri (ii), located in the northern part of Rajasthan, is the first.
- Alwar (iv) comes next, located south of Khetri.
- Bhilwara (i) is further south, located in the southern part of the state.
- Udaipur (iii) is located at the southernmost position among the listed cities.
Thus, the correct order is: Khetri (ii), Alwar (iv), Bhilwara (i), and Udaipur (iii).

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?