document.write( "Question 390391: A driver moving at a constant speed sees a log in the road, but it takes time for her to react. During the reaction time, the car keeps going at the same speed. The distance the car travels before the driver breaks is the reaction distance. At 75 miles/hour, the reaction distance is 165 feet. What is the reaction time in seconds? \n" ); document.write( "

Algebra.Com's Answer #276785 by josmiceli(19441) $\"\"$ $\"About$

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$\"d+=+r%2At\"$
\n" ); document.write( " $\"t+=+d%2Fr\"$
\n" ); document.write( "given:
\n" ); document.write( " $\"d+=+165\"$ ft
\n" ); document.write( " $\"r+=+75\"$ mi/hr
\n" ); document.write( "-----------
\n" ); document.write( " $\"r+=+75\"$ mi/hr x $\"1%2F3600\"$ hr/sec = $\".020833\"$ mi/sec
\n" ); document.write( " $\"r+=+.020833\"$ mi/sec x $\"5280\"$ ft/mi = $\"110\"$ ft/sec
\n" ); document.write( "------------
\n" ); document.write( " $\"165+=+110%2At\"$ ft
\n" ); document.write( " $\"t+=+165%2F110\"$
\n" ); document.write( " $\"t+=+1.5\"$ sec \n" ); document.write( "

\n" );