A man drives to a town at 30 km/h and returns by the same road at 60 km/h. His average speed for the whole journey is:

  1. 44 km/h
  2. 40 km/h
  3. 36 km/h
  4. 45 km/h
Answer

B) 40 km/h

For equal distances, average speed = dfrac2xyx+y = dfrac2 30 6090 = 40 km/h (not the simple average 45).

Quantitative Reasoning MCQ · More Speed, Time, Work & Ages MCQs · Practise