The discovery of the Harappan civilization was a result of significant efforts by several archaeologists:
Daya Ram Sahni (1921): Conducted the first excavations at Harappa, uncovering the remains of a highly developed urban culture. He unearthed seals, pottery, and structural remains.
R.D. Banerji (1922): Discovered Mohenjo-Daro, another major Harappan site, and identified its advanced urban planning and drainage systems.
John Marshall: As the Director-General of the Archaeological Survey of India, Marshall recognized the significance of these findings and formally announced the discovery of the Indus Valley Civilization in 1924.
Mortimer Wheeler: Used the stratigraphy method to analyze Harappan layers, contributing to a better understanding of the civilization’s chronology and urban structures.
E.J.H. Mackay: Conducted detailed excavations at Harappa and Mohenjo-Daro, revealing insights into daily life, trade, and craftsmanship.
These archaeologists collectively shed light on one of the oldest civilizations, highlighting its urban sophistication and cultural significance.

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?