A man travels by a car to his office at 60 ,km / h and returns home along same route at 20 ,km / h .

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4.Average

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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

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