document.write( "Question 1094814: A train, x m long, takes 30 seconds from the time it first enters a tunnel that is 400 m long, until it is completely through the tunnel. A stationary ceiling light in the tunnel is directly above the train for 10 seconds. Find the value, in metres, of x.
\n" ); document.write( "a) 350 b) 250 c) 450 d) 200 e) 300 \n" ); document.write( "

Algebra.Com's Answer #709396 by josmiceli(19441) $\"\"$ $\"About$

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From the time the front enters until the
\n" ); document.write( "rear of the train exits, the train has traveled
\n" ); document.write( " $\"+400+%2B+x+\"$ miles in $\"+30+\"$ sec
\n" ); document.write( "Rate of train = $\"+%28+400+%2B+x+%29+%2F+30+\"$
\n" ); document.write( "Rate = $\"+40%2F3+%2B+x%2F30+%29+\"$
\n" ); document.write( "The stationary light tells you that the rate
\n" ); document.write( "of the train is $\"+x%2F10+\"$
\n" ); document.write( "I can say now:
\n" ); document.write( " $\"+40%2F3+%2B+x%2F30+=+x%2F10+\"$
\n" ); document.write( " $\"+400+%2B+x+=+3x+\"$
\n" ); document.write( " $\"+x+=+200+\"$
\n" ); document.write( "The train is 200 m long
\n" ); document.write( "I get (d) for answer
\n" ); document.write( "Get another opinion if needed\r
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