Multiple choice

Shantanu covers a certain distance by car, driving at 35 km/hr and he returns back to the starting point riding a scooter with a speed of 25 km/hr. Find the average speed for the whole journey.

  1. 29.17 km/hr

  2. 26 km/hr

  3. 27.52 km/hr

  4. 30 km/hr
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A Correct answer
Explanation

Average speed for a round trip with speeds v1 and v2 is (2 * v1 * v2) / (v1 + v2). Here, (2 * 35 * 25) / (35 + 25) = 1750 / 60 = 29.166... which rounds to 29.17 km/hr.

AI explanation

When equal distances are traveled at two different speeds, we use the average speed formula: 2xy divided by (x + y). Substituting the given speeds, we get (2 multiplied by 35 multiplied by 25) divided by (35 + 25). This simplifies to 1750 divided by 60. The average speed for the whole journey is 29.17 km/hr.

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