A train travels a distance with speed 30 km/hr and returns with a speed of 50 km/hr. find the average speed of the train
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Their total distance of the journey = d + d = 2d
Total time, T = d/30 + d/50
So, its Average speed = Total distance/Total time
2d/(d/30 + d/50) = 37.5 Ans...
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2
2v1v2/v1+v2=37.5 it is the formula for average speed it is the correct formula
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