Given,
Velocity for one third of distance V1=20km/h
Velocity for two third of distance V2=60km/h
Time take to cover one third of distance t1=V1d/3=20d/3
Time taken to cover two third of distance t2=V22d/3=602d/3
Average velocity =totaltimeTotaldistance
Vav=t1+t2d=20d/3+602d/3d=36km/h
A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km/h. Finding the market closed, he immediately turns and walks back home with a speed of 7.5 km/h. The average speed of the man over the interval of time 0 to 40 min is equal to:
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