A boat can row downstream at 30 km and upstream at 12 km. If B takes 6 hours to cover each distance, then the velocity (in km/h) of the current is?

A boat can row downstream at 30 km and upstream at 12 km. If B takes 6 hours to cover each distance, then the velocity (in km/h) of the current is?
1). 1.2 km/h
2). 1.7 km/h
3). 1.5 km/h
4). 1.8 km/h

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