document.write( "Question 450526: An express train takes 3 seconds to enter a tunnel one kilometer long.if it is traveling at 120 km/hr,how long will it take to pass through the tunnel? \n" ); document.write( "

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An express train takes 3 seconds to enter a tunnel one kilometer long.if it is traveling at 120 km/hr,how long will it take to pass through the tunnel?
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\n" ); document.write( "Length of the train = (rate)(time)
\n" ); document.write( "= (120km/hr)(3 seconds)
\n" ); document.write( "---
\n" ); document.write( "= 120 km/(3600 sec))(3sec) = 120/1200 km
\n" ); document.write( "----
\n" ); document.write( "= 1/10 km (the train's length)
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\n" ); document.write( "Let distance be tunnel length + train length.
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\n" ); document.write( "time = distance / rate
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\n" ); document.write( "time = 1.1 km/(120km/hr)
\n" ); document.write( "= (1.1/120) hr
\n" ); document.write( "---
\n" ); document.write( "= 0.009167 hr
\n" ); document.write( "= 0.55 minutes
\n" ); document.write( "= 33 seconds
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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