A river flows west to east at 5 m min⁻¹. A swimmer on the south bank can swim at 10 m min⁻¹ in still water and wants to cross in the shortest time. He should swim:
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A river flows west to east at 5 m min⁻¹. A swimmer on the south bank can swim at 10 m min⁻¹ in still water and wants to cross in the shortest time. He should swim:
Options