A scooterist travels 20 km at a uniform speed of 60 km/h and the next 20 km at a uniform speed of80 km/h. Calculate its average speed.
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Answer:
Total distance = 40
Time1=1/3hr. By t=d/s
Time2=1/4hr
Total time=7/12hr
Avg. Speed = T. Dis/T. Time=40*12/7=480/7=68.571
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