on a 120 km track, a train moves the first 30 km at a uniform speed of 30km/h. how fast must the train travel in the next 90km so as to have average speed 60km/h for the entire trip
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time =d/s
t=120/30
t= 40 min
a.s = total d /total time
t=120/30
t= 40 min
a.s = total d /total time
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