A lifeguard who can swim at 1.2 m/s in still water wants to reach a dock positioned perpendicularly directly across a 550 m wide river.

1. If the current in the river is 0.80 m/s, how long will it take the lifeguard to reach the dock?

2. If instead she had decided to swim in such a way that will allow her to cross the river in a minimum amount of time, where would she land relative to the dock?

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  1. about time you did some. I passed the course in 1954.

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