document.write( "Question 438062: Pete is planning to take a motorboat ride for 80 miles and then take a rowboat for another 20 miles. He figures his motorboat can travel at a rate that is twice as fast as he can row the rowboat. If he wants to take 3 hours for the trip, how fast will he row the rowboat? \n" ); document.write( "
Algebra.Com's Answer #303026 by ankor@dixie-net.com(22740) You can put this solution on YOUR website! Pete is planning to take a motorboat ride for 80 miles and then take a rowboat for another 20 miles. \n" ); document.write( " He figures his motorboat can travel at a rate that is twice as fast as he can row the rowboat. \n" ); document.write( " If he wants to take 3 hours for the trip, how fast will he row the rowboat? \n" ); document.write( ": \n" ); document.write( "Let r = speed of the rowboat \n" ); document.write( "then \n" ); document.write( "2r = speed of the motorboat \n" ); document.write( ": \n" ); document.write( "Write a time equation: time = dist/speed \n" ); document.write( ": \n" ); document.write( "Rowboat time + motor time = 3 hrs \n" ); document.write( " \n" ); document.write( "multiply by 2s \n" ); document.write( "2s* \n" ); document.write( "Cancel the denominators, results \n" ); document.write( "2(20) + 80 = 6s \n" ); document.write( "40 + 80 = 6s \n" ); document.write( "120 = 6s \n" ); document.write( "s = \n" ); document.write( "s = 20 mph, an incredible speed for a rowboat \n" ); document.write( ": \n" ); document.write( ": \n" ); document.write( "Check solution using the time equation \n" ); document.write( " \n" ); document.write( "1 + 2 = 3 hrs \n" ); document.write( " \n" ); document.write( " |