document.write( "Question 141992: ii. You participate in a triathlon in which you swam 3 miles, ran 5 miles, and then bicycled 10 miles. You ran twice as fast as you swam, and cycled three times as fast as you swam. If your total time was 1 hr and 46 minutes, how fast did you swim? \n" ); document.write( "
Algebra.Com's Answer #103402 by ptaylor(2198)![]() ![]() You can put this solution on YOUR website! \n" ); document.write( "Distance(d) equals Rate(r) times Time(t) or d=rt; r=d/t and t=d/r\r \n" ); document.write( "\n" ); document.write( "Let r=swimming rate \n" ); document.write( "Then 2r=running rate \n" ); document.write( "And 3r=cycling rate\r \n" ); document.write( "\n" ); document.write( "Amount of time that you swam=3/r \n" ); document.write( "Amount of time that you ran=5/2r \n" ); document.write( "Amount of time that you cycled=10/3r\r \n" ); document.write( "\n" ); document.write( "Now we are told that the above times add up 1hr 46 min or 106 min (Note: we can't deal in both hours and minutes. We have to deal in one or the other so let's deal in minutes. By doing this, our answer will come out in miles/minute and we'll have to change it to miles/hr which is easy- we just multiply by 60--ok?)\r \n" ); document.write( "\n" ); document.write( "So:\r \n" ); document.write( "\n" ); document.write( "3/r+ 5/2r + 10/3r=106 multiply each term by 6r\r \n" ); document.write( "\n" ); document.write( "18+15+20=636r collect like terms\r \n" ); document.write( "\n" ); document.write( "53=636r divide both sides by 636\r \n" ); document.write( "\n" ); document.write( "r=0.0833333333333333-- miles/min\r \n" ); document.write( "\n" ); document.write( "Multiply this by 60 and we have swimming rate in miles/hr, so\r \n" ); document.write( "\n" ); document.write( "r=60*(0.083333333333333333333--)=5 miles/hr\r \n" ); document.write( "\n" ); document.write( "CK \n" ); document.write( "3/5+5/10+10/15=1 46/60=106/60=53/30 \n" ); document.write( "(18+15+20)/30=53/30\r \n" ); document.write( "\n" ); document.write( "53/30=53/30\r \n" ); document.write( "\n" ); document.write( "Hope this helps---ptaylor\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |