# Real boat situation.

To cross a river of width $$b = 320 \text{ m}$$, a captain steers his boat always aiming towards a point that is directly across the river from his starting point. The velocity of his boat relative to river current is $$v_{br} = 2.5 \text{ m/s}$$ and river current velocity is $$v_{r} = 1.5 \text{ m/s}$$ everywhere.

Determine the time $$t$$ (in seconds) the boat will take to cross the river.

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