Walking at $\frac{4}{5}$ of his usual speed, a man reaches his office $15 \text{ minutes}$ late. Find his usual time to reach the office.

Options:

• A: $45 \text{ minutes}$
• B: $60 \text{ minutes}$
• C: $75 \text{ minutes}$
• D: $90 \text{ minutes}$

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?