document.write( "Question 269634: a motorist drove 150 miles on country roads before driving 50 miles on mountain roads. the rate of speed on the country roads was 3 times the rate on mountain roads. the time spent traveling the 200 miles was 5 hours. find the rate of the motorist on country roads?\r
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document.write( "i let x=rate of the motorist on mountain road
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document.write( "and 3x rate of the motirist on country roads\r
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document.write( "i set up the equation x/200 - 3x/200 = 5
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Algebra.Com's Answer #197606 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! a motorist drove 150 miles on country roads before driving 50 miles on mountain roads. \n" ); document.write( "the rate of speed on the country roads was 3 times the rate on mountain roads. \n" ); document.write( "the time spent traveling the 200 miles was 5 hours. \n" ); document.write( "find the rate of the motorist on country roads? \n" ); document.write( "--- \n" ); document.write( "Country Road DATA: \n" ); document.write( "distance = 150 miles ; rate = 3x mph ; time = d/r = 150/(3x) = 50/x hrs. \n" ); document.write( "-------------------------------- \n" ); document.write( "Mountain Road DATA: \n" ); document.write( "distance = 50 miles ; rate = x mph ; time = d/r = 50/x hrs \n" ); document.write( "--------------------------------- \n" ); document.write( "Equation: \n" ); document.write( "time + time = 5 hrs \n" ); document.write( "2(50/x) = 5 \n" ); document.write( "100/x = 5 \n" ); document.write( "5x = 100 \n" ); document.write( "x = 20 mph on mountain Roads \n" ); document.write( "3x = 60 mph on country Roads \n" ); document.write( "===================================== \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( "===================================== \n" ); document.write( " \n" ); document.write( "i let x=rate of the motorist on mountain road \n" ); document.write( "and 3x rate of the motirist on country roads \n" ); document.write( "i set up the equation x/200 - 3x/200 = 5 \n" ); document.write( "Comment: x/200 is time/distance = rate \n" ); document.write( "But 5 is time \n" ); document.write( "You need an equation that says time + time = time. \n" ); document.write( " \n" ); document.write( " |