document.write( "Question 775332: A 100 metres long train is moving at 50 km/hr. An another train is 120 metres long is moving in opposite direction and crosses each other in 6 seconds. Find the speed of the second train? \n" ); document.write( "

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A 100 metres long train is moving at 50 km/hr. An another train is 120 metres long is moving in opposite direction and crosses each other in 6 seconds. Find the speed of the second train?\r
\n" ); document.write( "\n" ); document.write( "The sum of lengths of the trains is the distance the second train travels.\r
\n" ); document.write( "\n" ); document.write( "100+120m =220m=0.22km\r
\n" ); document.write( "\n" ); document.write( "Let speed of second train be x km/h\r
\n" ); document.write( "\n" ); document.write( "They are in opposite directions.
\n" ); document.write( "effective speed = x+50 km/h\r
\n" ); document.write( "\n" ); document.write( "Time = 6 seconds = 6/3600 seconds => 1/600 hours\r
\n" ); document.write( "\n" ); document.write( "d=rt\r
\n" ); document.write( "\n" ); document.write( "0.22=(x+50)*1/600\r
\n" ); document.write( "\n" ); document.write( "multiply by 600\r
\n" ); document.write( "\n" ); document.write( "0.22*600 =x+50\r
\n" ); document.write( "\n" ); document.write( "132=x+50\r
\n" ); document.write( "\n" ); document.write( "x=132-50\r
\n" ); document.write( "\n" ); document.write( "x=82 km/h \n" ); document.write( "

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