Question

You are a member of a production crew filming a nature explorer in the Rocky Mountains. The explorer needs to swim across a river to his campsite. By watching debris flowing down the river, you estimate that the stream is flowing at 0.621m/s. In still water, he can swim at 0.743m/s. At what angle with respect to the shoreline would you advise him to swim to travel directly across the stream to his campfire?