A body covers 2/3rd of its journey with a speed of 20m/s and remaining one 3rd of its journey with a speed 10m/s. Calculate the average speed.
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Let the total distance be 2x.
For first half distance :
Speed is 20 m/s
Thus time taken t
1
=
20
x
For second half distance :
Speed is 30 m/s
Thus time taken t
2
=
30
x
Average velocity V
avg
=
t
1
+t
2
2x
⟹ V
avg
=
20
x
+
30
x
2x
=
20+30
2×20×30
=24 m/s
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