A boat goes 15 km upstream and $10\frac{1}{2}$ km downstream in 3hours 15 minuts. It goes 12 km upstream and 14 km downstream in 3hours. What is the speed of the boat in still water?

A boat goes 15 km upstream and $10\frac{1}{2}$ km downstream in 3hours 15 minuts. It goes 12 km upstream and 14 km downstream in 3hours. What is the speed of the boat in still water?
1). 4
2). 6
3). 10
4). 14

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