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Problem 4.20 needs to row her boat across a 120 m-wide river that is flowing Mary to the east at a speed of 1 4 m/s Mary can

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d=1.4t t= 100 = 47.628 d=66.67 m 2. 1+1.42 v=J2. Ptler [V= 2.52 m/s

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