A man makes four trips of equal distances. His speed on first trip was 60 km/hr and in each subsequent trip his speed was half of the previous trip.What is the average speed (in km/hr) of the man in these four trips?

A man makes four trips of equal distances. His speed on first trip was 60 km/hr and in each subsequent trip his speed was half of the previous trip.What is the average speed (in km/hr) of the man in these four trips?
1). 16
2). 30
3). 28.125
4). 27.5

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