document.write( "Question 656697: A train travel 700 m in 35 Sec. What is its Speed in Km Per Hour? \n" ); document.write( "
Algebra.Com's Answer #409572 by Edwin McCravy(20060)\"\" \"About 
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document.write( "Speed = \"Distance%2F%28Time%29\" =\r\n" );
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document.write( "\"%28700m%29%2F%2835sec%29\"\r\n" );
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document.write( "Since 1000m = 1km,  \"1km%2F%281000m%29\" = 1, we can multiply by that\r\n" );
document.write( "without changing the value.\r\n" );
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document.write( "[We put \"m\" on the bottom to cancel the \"m\" on the top]:\r\n" );
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document.write( "\"%28700m%29%2F%2835sec%29\"×\"1km%2F%281000m%29\"\r\n" );
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document.write( "Since 60sec = 1min,  \"60sec%2F%281min%29\" = 1, we can multiply by that\r\n" );
document.write( "without changing the value.\r\n" );
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document.write( "[We put \"sec\" on the top to cancel the \"sec\" on the bottom]:\r\n" );
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document.write( "\"%28700m%29%2F%2835sec%29\"×\"1km%2F%281000m%29\"×\"60sec%2F%281min%29\"\r\n" );
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document.write( "Since 60min = 1hr,  \"%2860min%29%2F%281hr%29\" = 1, we can multiply by that\r\n" );
document.write( "without changing the value.\r\n" );
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document.write( "[We put \"min\" on the top to cancel the \"min\" on the bottom]:\r\n" );
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document.write( "\"%28700m%29%2F%2835sec%29\"×\"1km%2F%281000m%29\"×\"60sec%2F%281min%29\"×\"%2860min%29%2F%281hr%29\"\r\n" );
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document.write( "Now we cancel the m's:\r\n" );
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document.write( "\"%28700cross%28m%29%29%2F%2835sec%29\"×\"1km%2F%281000cross%28m%29%29\"×\"60sec%2F%281min%29\"×\"%2860min%29%2F%281hr%29\"\r\n" );
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document.write( "Now we cancel the sec's:\r\n" );
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document.write( "\"%28700cross%28m%29%29%2F%2835cross%28sec%29%29\"×\"1km%2F%281000cross%28m%29%29\"×\"60cross%28sec%29%2F%281min%29\"×\"%2860min%29%2F%281hr%29\"\r\n" );
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document.write( "Now we cancel the min's:\r\n" );
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document.write( "\"%28700cross%28m%29%29%2F%2835cross%28sec%29%29\"×\"1km%2F%281000cross%28m%29%29\"×\"60cross%28sec%29%2F%281cross%28min%29%29\"×\"%2860cross%28min%29%29%2F%281hr%29\"\r\n" );
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document.write( "and all we have left is\r\n" );
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document.write( "\"%28700%29%2F%2835%29\"×\"1km%2F%281000%29\"×\"60%2F%281%29\"×\"60%2F%281hr%29\"\r\n" );
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document.write( "\"%28700%2A60%2A60km%29%2F%2835%2A1000hr%29\"\r\n" );
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document.write( "\"2520000%2F35000\"\"km%2Fhr\"\r\n" );
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document.write( "72\"km%2Fhr\"\r\n" );
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document.write( "Edwin
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