Speeds of a boat along the current and against the current are 28 km/hr and 16 km/hr respectively. What is the speed (in km/hr) of the current?

Speeds of a boat along the current and against the current are 28 km/hr and 16 km/hr respectively. What is the speed (in km/hr) of the current?
1). 6
2). 22
3). 8
4). 12

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