document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=40887>Question 40887</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose Mr. Taylor's speed during journey from Pittsburgh to Chicago was 'x' mph. So his speed during journey from Chicago to Pittsburgh was 'x+15' mph. <BR>\n" );
document.write( "Time taken in up-journey = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=600%2Fx ALIGN=MIDDLE  ALT=\"600%2Fx\"   DISABLED_style= \"max-width:90%; height:auto;\" > hrs.<BR>\n" );
document.write( "Time taken in down-journey = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=600%2F%28x%2B15%29 ALIGN=MIDDLE  ALT=\"600%2F%28x%2B15%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > hrs.<BR>\n" );
document.write( "As down-journey takes 2 hrs. more so <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=600%2Fx+=+600%2F%28x%2B15%29+%2B+2 ALIGN=MIDDLE  ALT=\"600%2Fx+=+600%2F%28x%2B15%29+%2B+2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=600%2Fx+-+600%2F%28x%2B15%29+=+2 ALIGN=MIDDLE  ALT=\"600%2Fx+-+600%2F%28x%2B15%29+=+2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=9000%2F%28x%2A%28x%2B15%29%29+=+2 ALIGN=MIDDLE  ALT=\"9000%2F%28x%2A%28x%2B15%29%29+=+2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x%2A%28x%2B15%29%29+=+9000%2F2+=+4500 ALIGN=MIDDLE  ALT=\"%28x%2A%28x%2B15%29%29+=+9000%2F2+=+4500\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%5E2+%2B+15x+-+4500+=+0 ALIGN=MIDDLE  ALT=\"x%5E2+%2B+15x+-+4500+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Factorising<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x+%2B+75%29%28x+-+60%29+=+0 ALIGN=MIDDLE  ALT=\"%28x+%2B+75%29%28x+-+60%29+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "But here speed cannot be negative (as then the car goes in opposite direction and the problem is not valid) so x not equal to -75.<BR>\n" );
document.write( "Hence x = 60.<BR>\n" );
document.write( "Ans.: Thus the average speed of Mr. Taylor's car from Pittsburgh to Chicago was 60 mph. </SPAN>\n" );
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