On a 200km track, a train travels the first 50 km at a uniform speed of 40km/hr. How fast the train must travel 150km so as to maintain the average speed of 60km/hr for the whole journey.
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Answer:
time =200/60=20/6
average speed=Total distance/Total time
Time taken 50km=5/4
remaining time=20/6-5/4=25/12
speed=distance/time
150*12/25=72
remaining speed=72km/h
hope it will help u
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