document.write( "Question 1049571: Pratap Puri rowed 14 miles down a river in 2 hours, but the return trip took him 3 1/2 one half hours. Find the rate Pratap can row in still water and find the rate of the current \n" ); document.write( "

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Pratap Puri rowed 14 miles down a river in 2 hours, but the return trip took him 3 1/2 one half hours. Find the rate Pratap can row in still water and find the rate of the current
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Average speed down-river: 
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document.write( "Let speed in still water be S, and rate of current, C
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document.write( "Down-river equation: S + C = 7 ------- eq (i)\r
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document.write( "Average speed up-river: 
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document.write( "Up-river equation: S - C = 4 ------- eq (ii)
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document.write( "2S = 11 -------- Adding eqs (ii) & (i)
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document.write( "S, or rate in still water = , or \r
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document.write( "5.5 + C = 7 ------- Substituting 5.5 for S in eq (i)
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document.write( "C, or rate of current = 7 - 5.5, or  \n" );
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