An aeroplane flies from place A to place B at the speed of 500 km/hr. On the return journey, its speed is 700 km/hr. The average speed of the aeroplane for the entire journey is ?

A. $$566\frac{2}{3}{\text{ km/hr}}$$

B. $$583\frac{1}{3}{\text{ km/hr}}$$

C. $$583\frac{2}{3}{\text{ km/hr}}$$

D. $$600{\text{ km/hr}}$$

Answer: Option B

Solution(By Examveda Team)

Average speed :
$$\eqalign{ & {\text{ = }}\left( {\frac{{2 \times 500 \times 700}}{{500 + 700}}} \right){\text{ km/hr}} \cr & {\text{ = }}\left( {\frac{{1750}}{3}} \right){\text{ km/hr}} \cr & {\text{ = }}583\frac{1}{3}{\text{ km/hr}} \cr} $$