document.write( "Question 1045065: Jane took 30min to drive her boat upstream to water-ski at her favorite spot. Coming back in the day, at the same boat speed, to her 20 min. If the current in that part of the river is 7 km per hr, what was her boat speed in still water? \n" ); document.write( "
Algebra.Com's Answer #660472 by jorel555(1290)\"\" \"About 
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Let r be Jane's rate in still water. Then:
\n" ); document.write( "(1/2)/(r+7)=(1/3)/(r-7)
\n" ); document.write( "r+7/3=r-7/2
\n" ); document.write( "2r+14=3r-21
\n" ); document.write( "r=35 kmh. ☺☺☺☺
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