Question

An aeroplane flies from a to b at the rate of 500 km/hour and comes back from b to a at tge rate of 700 km/hour . the average speed of the aeroplane is

Answer 1

this may help u.....

Answer 2

Answer : Average speed is 583.33 km/h

Explanation :

It is given that,

Speed of Aeroplane from A to B is 500 km/hr

Speed of Aeroplane from B to A is 700 km/hr

Let d be the distance from going A to B. So, the total distance covered during entire journey is 2 d.

Time taken from A to B is $\dfrac{d}{500}\ h$

And Time taken from B to A is $\dfrac{d}{700}\ h$

So, average speed is :

$s=\dfrac{total\ distance}{total\ time}$

$s=\dfrac{2d}{\dfrac{d}{500}\ +\dfrac{d}{700}}$

$s=\dfrac{7000}{12}\ km/h$

$s=583.33\ km/h$

Average speed of an Aeroplane is 583.33 km/h.