document.write( "Question 484131: A man walking acros a train bridge is 0.65 of the way across the bridge when he hears a train coming. The speed of the train (vt)=60mph. The man run at top speed(constant)in either direction and just get off of the bridge before the train runs over him. How fast can the man run? \n" ); document.write( "

Algebra.Com's Answer #331249 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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A man walking across a train bridge is 0.65 of the way across the bridge when he hears a train coming.
\n" ); document.write( " The speed of the train (vt)=60mph.
\n" ); document.write( " The man run at top speed(constant)in either direction and just gets off of the bridge before the train runs over him.
\n" ); document.write( " How fast can the man run?
\n" ); document.write( ":
\n" ); document.write( "let m = running speed of the man
\n" ); document.write( ":
\n" ); document.write( ".35 is the dist from the end of the bridge that the train enters
\n" ); document.write( ":
\n" ); document.write( "From the information given, we know that he will run .35 of the way across the
\n" ); document.write( "bridge when the train enters the bridge.
\n" ); document.write( "If he runs away from the train, when train enters the bridge he will be:
\n" ); document.write( ".65 - .35 = .30 from the opposite side of the bridge from the train.
\n" ); document.write( "He has to run the remaining .3 dist while the train travels the whole dist; or 1
\n" ); document.write( "A ratio equation:
\n" ); document.write( " $\".3%2F1\"$ = $\"m%2F60\"$
\n" ); document.write( "m = .3(60)
\n" ); document.write( "m = 18 mph he has to run to just make it. \n" ); document.write( "

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