A person travelled from one place to another at an average speed of 40 ,km / h and back to original

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4.Average

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A person travelled from one place to another at an average speed of $40 \,km / h$ and back to the original place at an average speed of $50\, km / h$. What is his average speed in $km / h$ during the entire trip?

A

$45$

B

$20 \sqrt{5}$

C

$400 / 9$

D

$50$

Solution

Average speed of the person for his whole journey $=\frac{2 \times 40 \times 50}{(40+50)}=\frac{4000}{90}=\frac{400}{9} km / hr$

Standard 13

Quantitative Aptitude

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