Said can swim at 5 m/s in still water. He wishes to swim across a river 200m wide to a point directly opposite from where he is standing. The river flows westward at 4 m/s and he is standing on the south bank of the river. a) Draw a diagram. b) What is Said’s speed relative to the ground? c) In what direction must Said head? d) How long does it take to cross the river??

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