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A train travel some distance with speed 30 km/h and returns with speed of 45 km/h. calculate the average speed of train.

Give Answer In Full Step Or Method.


For same distance travelled avg speed(<v>) is 

2/<v>=1/30+1/45      ;here 2 bcoz train makes 2 trips 
THEREfore <v>=(2*30*45)/(30+45)
2 5 2
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