Multiple choice

A man covers half of his journey at $6$ km/hr and the remaining half at $3$ km/hr. His average speed is

  1. $3$ km/hr
  2. $4$ km/hr
  3. $4.5$ km/hr
  4. $9$ km/hr
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B Correct answer
Explanation

Average speed for equal distances is 2 * v1 * v2 / (v1 + v2). Here, 2 * 6 * 3 / (6 + 3) = 36 / 9 = 4 km/hr.

AI explanation

Since equal distances are traveled at two different speeds, apply the average speed formula 2xy / (x + y). Substituting the speeds gives (2 * 6 * 3) / (6 + 3), which simplifies to 36 / 9. His average speed is 4 km/hr.

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