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 0.629 m / s. in still water, he can swim at 0.731 m / s. at what angle, less than 90°, with respect to the shoreline would you advise him to swim to travel directly across the stream to his campfire? The water is near freezing in temperature. Typically a human can only swim in such water for about 300 seconds (or 5 minutes) before hypothermia sets in.

Part I: Calculate the time the explorer spends in the water if the river is 28.9 meters wide.

Do not copy and paste from Google, explain your answer clearly. Thanks.