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A car covers half of the a distance with speed 60km.hr. and rest of the half with speed 30km/hr. The average speed of the car is -
Let the distance be x , therefore total distance=2xSpeed1=60km/hTime taken for 1st half of the journey=(x/60)hrTime taken for finalhalf of journey=(x/30)hrTotal time=(x/60)+(x/30)=(x+2x)/60=3x/60Avg speed of the car =total distance/total time taken=2x/3x/60=2x*60/3x=40km/h (answer)
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