document.write( "Question 170053: If you had driven one mile at 30 mph, how fast must you drive the second mile so your average speed for the trip is 60mph.
\n" ); document.write( "Hint: The answer is not 90 mph. \n" ); document.write( "

Algebra.Com's Answer #125509 by stanbon(75887) $\"\"$ $\"About$

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If you had driven one mile at 30 mph, how fast must you drive the second mile so your average speed for the trip is 60mph
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\n" ); document.write( "1st mile DATA:
\n" ); document.write( "distance = 1 mile ; rate = 30 mph ; time = d/r = 1/30 hr
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\n" ); document.write( "2 mile DATA
\n" ); document.write( "distance = 2 miles ; rate = 60 mph; time = d/r = 2/60 = 1/30 hr
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\n" ); document.write( "2nd mile Information
\n" ); document.write( "distance = 1 mile ; time = (1/30)hr - (1/30)hr = 0 hrs
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\n" ); document.write( "You cannot average 60 mph by driving the 2nd mile at any speed.
\n" ); document.write( "The time required to drive the 2 miles at 60 mph is the same
\n" ); document.write( "as the time required to drive the 1st mile at 30 mph. After
\n" ); document.write( "the 1st mile you have used up all the time you need.
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "

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