On a 120 km track a train travels the first 40 km at uniform speed of 40 km / h^-1. How fast must the train travel the next 80 km so as the average 60 km/h ^-1 for entire trip?
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Answer:
Total time= Total distance/av. speed= 120/60=2 hrs
Case 1: Time taken for travelling 40 km
speed=40km/hr
distance= 40 km
time=distance/speed=40/40= 1 hrs
Case 2: Time taken for travelling next 80km
Time left= 2-1=1 hrs
s=80 km
speed= distance/time=80/1= 80 km/hr
Explanation:
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