The scales on which the old lady measured her height and weight were unreliable. Because they were outdated and imprecise, they misrepresented the weight, and the lady had changed them to reflect more height. People want to picture themselves as thinner and taller, thus they were flattering to them, according to her thinking.

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?