document.write( "Question 838691: A train covered x km at 45 kmph & then another x km at 36 kmph. Find the average speed of the train in covering the entire journey.
\n" ); document.write( "A)40 kmph
\n" ); document.write( "B)38 kmph
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Algebra.Com's Answer #505225 by Alan3354(69443)\"\" \"About 
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A train covered x km at 45 kmph & then another x km at 36 kmph. Find the average speed of the train in covering the entire journey.
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\n" ); document.write( "Avg speed of a round trip, or of 2 equal segments is
\n" ); document.write( "2*45*36/(45 + 36) = 3240/81
\n" ); document.write( "= 40 km/hr
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\n" ); document.write( "Notice the distance is not relevant.
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