document.write( "Question 380321: Please write equation and solve.
\n" ); document.write( "A car travels 120 miles in the same time that another car, which is going 15 MPH faster, travels 180 miles. What is the speed of each car? \n" ); document.write( "

Algebra.Com's Answer #269897 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!


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document.write( "Hi,
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document.write( "Let x and (x+15mph) represent the speeds of the cars. x being the slower car's speed.
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document.write( "D = r*t OR D/r = t  Times are the same in this example, sets up the equality:
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document.write( " 120mi/x = 180mi/(x+15mph)
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document.write( "cross multiply to solve for x
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document.write( "120(x+15) = 180x
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document.write( "120*15 = 60x
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document.write( "30mph = x , the speed of the the slower car.  
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document.write( "the faster speed of the other car is 45mph    (30mph + 15 mph)
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document.write( "CHECKING our answer
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document.write( "  120mi/30mph = 180mi/45mph = 4hrs (misc info as to the time each traveled) \n" );
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