Question

a motorcyclists drives a to b with a speed of 30km per hour and returns back with a speed of 20km per hour. find its average speed

Answer 1

hello friend...!!

According to the question, the motorcyclist drives from A to B

let us consider the distance covered as
' X ' , the person will cover the sane distance when he returns back.

therefore the total distance covered by him is equals to

X + X = 2X

it is given that speed is equals to 30km / hr

implies, time = X / 30 ----( 1 )

similarly while returning back the time taken is

T = X / 20 ------( 2 )

we know that,

Average speed =

total distance / total time taken

therefore

average speed = 2X / ( x/30 + x/20)

average speed = ( 2 * 600 )X / 50x

therefore,

average speed = 24 km / hr.


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Hope it is useful...!!