Question

A motorcyclist drives from A to b with a uniform speed of 30 km/h and returns back with a speed of 20 km/h. Find its average speed.

Answer 1

let the distance be x

while going........

d=xkm

speed=30km/hr

time=d/s=x/30

while coming........

d=x

speed=20km/hr

time=x/20

now,avg speed=total distance /total time 

                         =x+x/x/20+x/30

                         =2x/5x/60

                         =2*12

                         =24km/hr

Answer 2

$\huge\fbox\red{See The Attachment}$

$\huge\boxed{\fcolorbox{red}{ink}{Hope you understand}}$