document.write( "Question 1017321: Julie and Eric row their boat (at constant speed ) 40 miles downstream for 4 hours, helped by the current. Rowing at the same rate, the trip back against the current takes 10 hours. Find the rate of the current. \n" ); document.write( "

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\n" ); document.write( "Julie and Eric row their boat (at constant speed ) 40 miles downstream for 4 hours, helped by the current. Rowing at the same rate, the trip back against the current takes 10 hours. Find the rate of the current.
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Let speed in still water be S, and speed of current, C
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document.write( "Then, downstream speed equation is: ______S + C = 10______S = 10 - C ------- eq (i)
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document.write( "Also, upstream speed equation is: ______S - C = 4 ------- eq (ii)
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document.write( "10 - C - C = 4 ------- Substituting 10 - C for S in eq (ii)
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document.write( "      - 2C = 4 - 10
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document.write( "      - 2C = - 6
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document.write( "C or speed of current = , or  \n" );
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