document.write( "Question 728440: A runner runs 80 km per hour after 1 second he was running 90 km per hour what is the average of the runners speed ?
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Algebra.Com's Answer #445409 by Alan3354(69443)\"\" \"About 
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A runner runs 80 km per hour after 1 second he was running 90 km per hour what is the average of the runners speed ?
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\n" ); document.write( "If the acceleration from 80 to 90 is constant, his average for that 1 second period is 85 km/hr.
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\n" ); document.write( "He's faster than most runners, never seen a human run that fast.
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