document.write( "Question 985002: An automobile can travel 200 kilometers in the same time that a truck can travel 150 kilometers. If an automobile travels at a speed of 15 kph faster than the truck, what is the speed of the automobile?
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Algebra.Com's Answer #605863 by MathTherapy(10552) $\"\"$ $\"About$

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\n" ); document.write( "An automobile can travel 200 kilometers in the same time that a truck can travel 150 kilometers. If an automobile travels at a speed of 15 kph faster than the truck, what is the speed of the automobile?
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Let auto's speed be S
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document.write( "Then truck's speed is: S - 15
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document.write( "Time auto takes to travel 200 km: 
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document.write( "Time truck takes to travel 150 km: 
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document.write( "Since times are the same, we get:
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document.write( "200(S - 15) = 150S ----- Cross-multiplying
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document.write( "200S - 3,000 = 150S
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document.write( "200S - 150S - 3,000
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document.write( "50S = 3,000
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document.write( "S, or auto's speed = , or  km/h \n" );
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