The speed of a boat in a still river is 10km/h. It is not influenced by the river.
The speed of the river is 3km/h. It is not influenced by the speed of the boat.
The boat's speed moving along the river is 10 + 3 = 13 (km/h)
The boat's speed moving against the speed of the river is 10 - 3 = 7 (km/h)
Let's say out of curiousity we substract the boat's speed along the river (13km/h) by the speed of the boat against the river (7km/h) and we get 13 - 7 = 6 (km/h)
We see that the substraction equates to twice the speed of the river (6km/h / 2km/h = 3km/h). Why is that? is there a mathematical principal/law that can explain this phenomenon?
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15 km/h north
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