Time and Distance - Quantitative Aptitude (MCQ) questions for Q. 760

Q.  A man travels from A to B at a speed of 30 kmph and returns with a speed of 60 kmph. What is the average speed of the man?
- Published on 06 Jul 15

a. 47.5
b. 50
c. 45
d. 40

ANSWER: 40
 
The average speed ‘v’, when a man travels two same distance with different speeds ‘v1’ and ‘v2’ is:
v = (2*v1*v2) / (v1 + v2)
In the above problem, v1 = 30 and v2 = 60
Therefore, v = (2*30*60)/(30 + 60) = 3600/90
v = 40

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