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)![]() ![]() ![]() You can put this solution on YOUR website! 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. ☺☺☺☺ \n" ); document.write( " |