\[ \begin{array}{|l|r|r|} \hline \textbf{Particulars} & \textbf{\% of Revenue (2022--23)} & \textbf{\% of Revenue (2021--22)} \\ \hline \text{Revenue from operations} & 100.00\% & 100.00\% \\ \text{Purchase of stock in trade} & 10.00\% & 10.00\% \\ \text{Other expenses} & 1.00\% & 1.00\% \\ \text{Profit before tax} & 89.00\% & 89.00\% \\ \text{Tax (50\%)} & 44.50\% & 44.50\% \\ \text{Profit after tax} & 44.50\% & 44.50\% \\ \hline \end{array} \]

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?