document.write( "Question 311137: Gravies average driving speed is 4 kilometers per hour faster than Richards. In the same length of time it takes Gracie to drive 265 kilometers Richard drives 252 kilometers. What is gravies average speed? \n" ); document.write( "

Algebra.Com's Answer #222707 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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Gravies average driving speed is 4 kilometers per hour faster than Richards.
\n" ); document.write( " In the same length of time it takes Gracie to drive 265 kilometers Richard drives 252 kilometers.
\n" ); document.write( " What is gravies average speed?
\n" ); document.write( ":
\n" ); document.write( "Let s = g's speed
\n" ); document.write( "then
\n" ); document.write( "(s-4) = r's speed
\n" ); document.write( ":
\n" ); document.write( "Write a time equation; time = dist/speed
\n" ); document.write( " $\"265%2Fs\"$ = $\"252%2F%28%28s-4%29%29\"$
\n" ); document.write( "cross multiply
\n" ); document.write( "265(s-4) = 252s
\n" ); document.write( "265s - 1060 = 252s
\n" ); document.write( "265s - 252s = 1060
\n" ); document.write( "13s = 1060
\n" ); document.write( "s = $\"1060%2F13\"$
\n" ); document.write( "s = 81.538 km/hr is g's speed
\n" ); document.write( ":
\n" ); document.write( ";
\n" ); document.write( "Check the times, they should be equal: (77.538) = r's speed
\n" ); document.write( "265/81.538 = 3.25 hrs
\n" ); document.write( "252/77.538 = 3.25 hrs
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