Lost and Found Department
This is to inform all students that the school has set up a 'Lost and Found Department' in the main office. Any student who has lost an item is requested to report the following details:
- A brief description of the lost item
- The date, time, and location where it was lost
- Contact information
Please report all lost items promptly to help us return them to their rightful owners.
For more information, visit the Lost and Found Department.
President, Lost and Found Department

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?