document.write( "Question 128621This question is from textbook Introductory Algebra
\n" ); document.write( ": The problem reads to solve: The time t required to drive a fixed distance varies inversely as the speed r. It takes 5 hr at 55mph to drive a fixed distance. How long would it take at 40mph?\r
\n" ); document.write( "\n" ); document.write( "Any help with this problem would be greatly appreciated. \n" ); document.write( "

Algebra.Com's Answer #94117 by Earlsdon(6294) $\"\"$ $\"About$

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Try this:
\n" ); document.write( " $\"t+=+k%2Fr\"$ Now you need to find the value of k, the constant of variation. Substitute the given values of r = 55mph and t = 5hr.
\n" ); document.write( " $\"5+=+k%2F%2855%29\"$ Multiply both sides by 55.
\n" ); document.write( " $\"275+=+k\"$ Now rewrite the variation as:
\n" ); document.write( " $\"t+=+275%2Fr\"$ Substitute r = 40mph
\n" ); document.write( " $\"t+=+275%2F40\"$
\n" ); document.write( " $\"t+=+6.875\"$ hours or t = 6 hours and 52.5 minutes.
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