On a 120 km track , a train travels travels the first 30 km at a uniform speed of 30km/h. how fast must the train travel the next 90 km so that the average total speed for the trip is 60km/h
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also write first the following
average speed = total distance /total time
60 = 120/ total time
and total time = 120/60 hrs
=2hrs
average speed = total distance /total time
60 = 120/ total time
and total time = 120/60 hrs
=2hrs
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