A train runs from Howrah to Bandel at an average speed of 20km/ hr and returns at an average speed of 30 km/hr. The average speed (in km/hr) of the train in the whole journey is

A train runs from Howrah to Bandel at an average speed of 20km/ hr and returns at an average speed of 30 km/hr. The average speed (in km/hr) of the train in the whole journey is
1). 20
2). 22.5
3). 24
4). 25

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