A river 100 m wide flows 1 m/s due south. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. Relative to its starting point, the boat travels
A) nowhere.
B) 100 m.
C) 141 m.
D) 200 m.
E) more than 200 m.
Answer: C
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Fill in the blank(s) with correct word