Home Aptitude & Reasoning MCQs

Question

A bus covers the first half of a certain distance with speed v1 and the second half with a speed v2. The average speed during the whole journey is:

  1. v1v2/(v1+v2)
  2. 2v1v2/(v1+v2)
  3. (v1+v2)/2
  4. √v1v2

Answer:

Option B: 2v1v2/(v1+v2)

Detailed Solution:

The correct answer is “2v1v2/(v1+v2)”.

The formula for the average speed when the distance is divided into two equal parts and each part is covered with different speeds is given by the harmonic mean: 2v1v2/(v1+v2)