document.write( "Question 481120: a man can row at 5 km/h in still water.he rows upstream 3 km back to his starting point.if the total time is 1 hour 15 min ,the speed of the current is \n" ); document.write( "
Algebra.Com's Answer #329456 by mananth(16946)![]() ![]() You can put this solution on YOUR website! boat speed = 5 kmph \n" ); document.write( "current speed = x kmph \n" ); document.write( " \n" ); document.write( "upstream speed = 5 - x \n" ); document.write( "downstream speed = 5 + x \n" ); document.write( " \n" ); document.write( "Total distance = 3 km Total Time= 1.25hours \r \n" ); document.write( "\n" ); document.write( "3 /( 5 - x )+ 3 /( 5 + x )= 1.25 \n" ); document.write( "3 ( 5 + x )+ 3 ( 5 - x )= 1.25 \n" ); document.write( "15 + 3 x + 15 -3 x = 1.25 ( 15^2-x^2) \n" ); document.write( "30 = 1.25 ( 25 - x^2 ) \n" ); document.write( "30 = 31.25 -1.25 X^2 \n" ); document.write( "X ^2 = 1.25 \n" ); document.write( "X^2 1 \n" ); document.write( "x= 1 km/h \n" ); document.write( "m.ananth@hotmail.ca \n" ); document.write( " \n" ); document.write( " |