Question

i travelled at a speed of 600 km/hours from chennai to coimbatore and returned at speed of 800 km/hr.Find my average speed

Answer 1

heya , plz refer the above pic for your answer

Answer 2

Answer : My average speed is 685.7 Km.

Explanation :

Speed while travelling from Chennai to Coimbatore is 600 Km/h.

Time while travelling from Chennai to Coimbatore is $\dfrac{x}{600\ km/h}$

Speed while travelling from  to Coimbatore to Chennai is 800 Km/h.

Time while travelling from  to Coimbatore to Chennai is $\dfrac{x}{800\ km/h}$

Let the total distance covered during entire journey is 2 x.

We know that,

$speed=\dfrac{distance}{time}$

$s=\dfrac{2x}{\dfrac{x}{600\ km/h}+\dfrac{x}{800\ km/h}}$

$s=\dfrac{200\times 24}{7}$

$s=685.7\ Km$

Hence, this is the required solution.