document.write( "Question 1115132: Mary can walk 4 mph and Judy can bike 10 mph. If they start at the same point and travel in the same direction, how long will it take Mary to be 8 miles behind Judy?
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Algebra.Com's Answer #730043 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! Mary can walk 4 mph and Judy can bike 10 mph. If they start at the same point and travel in the same direction, how long will it take Mary to be 8 miles behind Judy? \n" ); document.write( "------------ \n" ); document.write( "Mary DATA: \n" ); document.write( "rate = 4 mph ; dist = x miles ; time = x/4 hrs \n" ); document.write( "Judy DATA: \n" ); document.write( "rate = 10 mph ; dist = x+8 miles ; time = (x+8)/10 hrs \n" ); document.write( "------- \n" ); document.write( "Equation: \n" ); document.write( "time = time \n" ); document.write( "x/4 = (x+8)/10 \n" ); document.write( "10x = 4x + 32 \n" ); document.write( "6x = 32 \n" ); document.write( "x = 16/3 miles \n" ); document.write( "---- \n" ); document.write( "Ans: time = x/4 = (16/3)/4 = 4/3 hr = 1 hr 20 min \n" ); document.write( "------------ \n" ); document.write( "Cheers, \n" ); document.write( "stan H. \n" ); document.write( "------------------ \n" ); document.write( "---------------------- \n" ); document.write( " |