a car travels 30km at a uniform speed of 40km/h and the next 30 km at a uniform speed of 40 km/hr and the next 30 pm at a uniform speed of 20 km/hr Find The average speed?
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Time taken for first 30 km =30/40hrs
Time taken for next 30 km = 30/40hrs
Time taken for last 30 km = 30/20 hrs
Therefore,
average speed = total distance covered/total time taken
= (30 +30+30)/[(30/40)+(30/40)+(30/20)]
= 120/3=40 km/ h
Time taken for next 30 km = 30/40hrs
Time taken for last 30 km = 30/20 hrs
Therefore,
average speed = total distance covered/total time taken
= (30 +30+30)/[(30/40)+(30/40)+(30/20)]
= 120/3=40 km/ h
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