document.write( "Question 398817: A truck left Huck’s trucks and traveled north on 80 km/h. one hour later, anther truck left Huck’s trucks and traveled south at 60 km/h. how many hours had the first truck traveled when they were 150 km apart? \n" ); document.write( "

Algebra.Com's Answer #282511 by josmiceli(19441) $\"\"$ $\"About$

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when the 2nd truck left, the 1st truck
\n" ); document.write( "traveled $\"d+=+80%2A1\"$
\n" ); document.write( " $\"d+=+80\"$ km
\n" ); document.write( "Let $\"t\"$ = time in hours after 2nd truck leaves
\n" ); document.write( "and they are $\"150\"$ km apart
\n" ); document.write( "The second truck travels $\"d%5B2%5D+=+60t\"$
\n" ); document.write( "The 1st truck travels $\"d%5B1%5D+=+80t\"$
\n" ); document.write( "I have to add $\"d+%2B+d%5B1%5D+%2B+d%5B2%5D+=+150\"$ km
\n" ); document.write( " $\"80+%2B+80t+%2B+60t+=+150\"$
\n" ); document.write( " $\"140t+=+70\"$
\n" ); document.write( " $\"t+=+.5\"$ hrs
\n" ); document.write( "The 1st truck had traveled $\"1+%2B+.5\"$ = 1.5 hrs
\n" ); document.write( "when they were 150 km apart
\n" ); document.write( "check answer:
\n" ); document.write( " $\"d%5B1%5D+=+80t\"$
\n" ); document.write( " $\"d%5B1%5D+=+80%2A.5\"$
\n" ); document.write( " $\"d%5B1%5D+=+40\"$
\n" ); document.write( "and
\n" ); document.write( " $\"d%5B2%5D+=60t\"$
\n" ); document.write( " $\"d%5B2%5D+=+60%2A.5\"$
\n" ); document.write( " $\"d%5B2%5D+=+30\"$
\n" ); document.write( "and
\n" ); document.write( " $\"d+%2B+d%5B1%5D+%2B+d%5B2%5D+=+150\"$
\n" ); document.write( " $\"80+%2B+40+%2B+30+=+150\"$
\n" ); document.write( " $\"150+=+150\"$
\n" ); document.write( "OK \n" ); document.write( "

\n" );