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- Quantitative Aptitude
4.Average
medium
A man travels by a car to his office at $60 \,km / h$ and returns home along the same route at $20 \,km / h .$ Find the average speed of his whole journey. (in $km/h$)
A
$40$
B
$50$
C
$30$
D
$25$
Solution
Average speed $=\frac{20 \times 60 \times 20}{60+20}=\frac{2 \times 60 \times 20}{80}=30 \,km / h$
Standard 13
Quantitative Aptitude