# A train travels between two station A and B.while going from A to B its average speed 100 km/h and when coming back from B b to A its average speed is 150 km/h. find the average speed during the whole journey.

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The formula for avg. speed is 2V1V2/V1+V2

=(2*100*150)/100+150

=30000/250

=120KMPH

=(2*100*150)/100+150

=30000/250

=120KMPH