Multiple choice

Arjun travelling from Pune to Goa, covers a distance of 1000 km at 4 km/hr and the return journey at 3 km/hr. What was his average speed during his entire journey?

  1. 3 km/hr

  2. 3.43 km/hr

  3. 3.5 km/hr

  4. 5.4 km/hr.

  5. NA
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Average speed = (2 * d1 * d2) / (d1 + d2) for equal distances. Average speed = (2 * 4 * 3) / (4 + 3) = 24 / 7 = 3.428... which rounds to 3.43 km/hr.

AI explanation

When equal distances are travelled at two different speeds, the average speed is calculated using the harmonic mean formula: 2xy divided by (x plus y). Substituting the speeds 4 km/hr and 3 km/hr into the formula gives 2 multiplied by 4 multiplied by 3 divided by (4 plus 3). This simplifies to 24/7, which equals approximately 3.43 km/hr.

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