document.write( "Question 447900: sarah drove for 7 hours at an average speed of 55 mi/h. for the first 3 hours, she drove 45 mi/h. what was her average speed for the last 4 hours? \n" ); document.write( "

Algebra.Com's Answer #308345 by rwm(914) $\"\"$ $\"About$

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7*55=3*45+4x
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