Question

one car moving on a straight road covers one third of distance with 20 km/h and rest with 60 km/h calculate the average speed

Answer 1

average speed=20+60/2
=40km/h

Answer 2

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REMANING DISTANCE =1-1/3=2/3

now, divide 2/3 in two equal parts...I.e.
1/3 each

now apply hormonic mean if distance is same...

3v1v2v3 / v1v2 +v2v3+v1v3

=3x 20x60x60/20x60 +60x60+20x60

=216000/6000

=36KM/ Hr

HOPE IT WILL HELP YOU