Question

A scooterist goes to a place at a speed of 20km/hr and returns from there at a speed of 30km/hr. Find the average speed in km/hr for the entire journey

Answer 1

Formula- 2V1V2/V1+V2
Here V1= 20km/hr
V2=30km/hr
So , 2×20×30/20+30
=1200/50
=24km/hr
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Answer 2

Given :

Initial speed of scooterist , u = 20 km/hr .

Final speed of scooterist , v = 30 km/hr .

To Find :

The average speed in km/hr for the entire journey .

Solution :

We know , average of two quantity x and y is given by :

$Avg =\dfrac{x+y}{2}$

So , average velocity is given by :

$v_{avg}=\dfrac{u+v}{2}\\\\v_{avg}=\dfrac{20+30}{2}\\\\v_{avg}=25\ km/hr$

Therefore , the average speed in km/hr for the entire journey is 25 km/hr .

Learn More :

Kinematics

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