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Amit walks from his home to his office at a speed of 10 km/hr and in the return journey with a speed of 15 km/hr. Find the average speed of Amit during the whole journey?
1. 12 km/hr
2. 11 km/hr
3. 13 km/hr
4. 10 km/hr

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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× Speed2)/(Speed1 + Speed2)

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.

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