A man takes $40 \text{ seconds}$ to walk up a moving escalator. If he walks twice as fast, it takes him $30 \text{ seconds}$. How long would it take him to walk up the escalator if it were stationary?

Options:

• A: $60 \text{ s}$
• B: $80 \text{ s}$
• C: $100 \text{ s}$
• D: $120 \text{ s}$

Related Practice Questions:

• Which of the following artifacts, extensively found at Burzahom and Gufkral, specifically indicates that the Neolithic inhabitants of Kashmir practiced sewing animal skins for clothing to survive the harsh winters?
• The earliest known evidence of rock art in India, in the form of 'Cupules' (hemispherical cup-shaped depressions carved into rock), belongs to the Lower Paleolithic age and was found at:
• The first human colonization of the fertile Ganga plains, as evidenced by archaeological discoveries at Sarai Nahar Rai and Mahadaha, took place during which period?
• Which prehistoric site located in the Thar Desert of Rajasthan provides a continuous and undisturbed profile of Lower, Middle, and Upper Paleolithic cultures?