on a 90 km track a train travels the first 30 km at a uniform speed of 30km/hr. Calculate the speed with which the train should move rest of the track so as to get the average speed of 60km/hr for the entire trip..
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v1=30km and v2( to be determined )
average speed =60km/he
30+30=60kmperhr
average speed =60km/he
30+30=60kmperhr
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