A car travels 20 km at a uniform speed of 40 km/h and the next 40 km at a uniform speed of 20 km/h.Find the average speed of the car
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Time taken by the car to travel first 20km=20/40=1/2hrs.
Time taken by the car to travel another 20km=20/60=1/3hrs
Total time=1/2+1/3=5/6hrs
Average speed=total distance/total time
=40/5/6=48km/hr
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