Question

A person X moves from point AtoB with uniform speed of 30 kmph BtoA with speed of 60 kmph then average speed is......,...........

Answer 1

Hii...
Here is your answer..

Solution:-
Let Distance travelled from A to B be x
Total covered from A to B and B to A =2x

Now,

From A to B:-

Distance=x
Speed = 30km/h
Time taken=D/S
$= > \frac{x}{30}$

From B to A:-

Distance=x
Speed=60km/h
Time taken=D/S
$= > \frac{x}{60}$
Now,
$= > average \: speed = \frac{total \: distance}{total \: time}$
Here,
Total distance=x+x=2x
Total speed=
$= > \frac{x}{30} + \frac{x}{60} \\ = > \frac{2x + x}{60} \\ = > \frac{3x}{60}$
Therefore,
Average speed=
$= > \frac{2x}{ \frac{3x}{60} } \\ = > \frac{2x \times 60}{3x}$
$= > \frac{120x}{3x} \\ = > 40$
Hence,
Average speed=40km/h

Hope it helps uh...✌️✌️✌️