document.write( "Question 1173878: A swimmer aims his body North directly across a 80 m river at a velocity of 1.2 m/s. If the river is moving West at 0.7 m/s, (a) how far downstream will he land and (b) how long will it take him to cross the river? \n" ); document.write( "

Algebra.Com's Answer #799436 by Alan3354(69443) $\"\"$ $\"About$

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A swimmer aims his body North directly across a 80 m river at a velocity of 1.2 m/s. If the river is moving West at 0.7 m/s, (a) how far downstream will he land and (b) how long will it take him to cross the river?
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\n" ); document.write( "Assuming \"aims his body north\" means he swims facing North:
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\n" ); document.write( "If the river is moving West at 0.7 m/s
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\n" ); document.write( "Currents and wind are given as the direction they're from.
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\n" ); document.write( "It's a vector problem with a right triangle.
\n" ); document.write( "His speed is the hypotenuse with sides of 1.2 and 0.7
\n" ); document.write( "c^2 = 1.2^2 + 0.7^2
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\n" ); document.write( "Time to cross = 80/c = t
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\n" ); document.write( "Distance downstream = 0.7*t \n" ); document.write( "

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