document.write( "Question 1039047: two trains 150 km apart travel toward each other on parallel tracks, each moving at 25 km/hr. A bird flies back and forth between the trains at 15 km/hr until the trains pass each other. How far does the bird fly?
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Algebra.Com's Answer #653769 by ikleyn(52824)\"\" \"About 
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\n" ); document.write( "two trains 150 km apart travel toward each other on parallel tracks, each moving at 25 km/hr.
\n" ); document.write( "A bird flies back and forth between the trains at 15 km/hr until the trains pass each other. How far does the bird fly?
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\n" ); document.write( "\n" ); document.write( "Answer. 45 km.\r
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\n" ); document.write( "\n" ); document.write( "The trains pass each other in \"150%2F%2825%2B25%29\" = \"150%2F50\" = 3 hours.\r
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\n" ); document.write( "\n" ); document.write( "The bird flies 15*3 = 45 km during this time.\r
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\n" ); document.write( "\n" ); document.write( "It is well known old joking problem.\r
\n" ); document.write( "\n" ); document.write( "Well-known for more than 100 years.\r
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\n" ); document.write( "\n" ); document.write( "Ha-ha-ha.\r
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