Harry Hagberd, Captain Hagberd's son, was the stranger. Captain was anxious at first meeting a stranger since the other was talking about his kid, and then he lost control when the stranger said, "The devil he is!" Captain began shouting, his feet squelched in the puddles left by his work, as the stranger gazed in awe. He crawled across the destroyed grass plot's holes. He dashed into the barrier, blindly.

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?