Correct Answer - Option 1 : 12 km/hr

**Given:**

The speed of Amit when he walks from home to office is 10 km/hr

When he travels from his office to home speed is 15 km/hr.

**Formula Used:**

The average speed of the during the same distance = (2 × Speed_{1 }× Speed_{2})/(Speed_{1} + Speed_{2})

**Calculation:**

As given, The two speeds of Amit are 10 km/hr and 15 km/hr respectively.

⇒ The average speed of Amit = (2 × 10 × 15)/(10 + 15)

⇒ The average speed of Amit = 12 km/hr

**∴ The speed of Amit is 12 km/hr.**