document.write( "Question 352578: An aeroplane flies along the four sides of a square field at speeds of 200, 400,600,800km/hr. The average speed of the plane in the flight around the field in km/hr is: \n" ); document.write( "
Algebra.Com's Answer #251976 by mananth(16946)\"\" \"About 
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let the length of field be x km
\n" ); document.write( "Total distance it flew = 4x km
\n" ); document.write( "total time taken = x/200 +x/400 + x/600 + x/800
\n" ); document.write( "LCM = 2400
\n" ); document.write( "Total time = 12x+6x+4x+3x /2400
\n" ); document.write( "= 25x/2400 hours
\n" ); document.write( "...
\n" ); document.write( "Average speed = total distance / total time
\n" ); document.write( "4x / (25x/2400)
\n" ); document.write( "Average speed = 4x*2400/25x
\n" ); document.write( "=4*96
\n" ); document.write( "= 384 km/h ...
\n" ); document.write( "m.ananth@hotmail.ca
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