Multiple choice

For a man covering a certain distance at 6 km/hr and returning at 4 Km/hr. The average speed of the man is

  1. 1.2 km/hr

  2. 2.4 km/hr

  3. 3.6 km/hr

  4. 4.8 km/hr
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D Correct answer
Explanation

Average speed for round trip = 2xy / (x+y) = 2(6)(4) / (6+4) = 48 / 10 = 4.8 km/hr.

AI explanation

When equal distances are covered at two different speeds, the average speed is found using the harmonic mean formula: (2 * v1 * v2) / (v1 + v2). Substituting the given speeds gives (2 * 6 * 4) / (6 + 4). Calculating this results in an average speed of 4.8 km/hr.

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