document.write( "Question 1189258: Please help me to solve this question!!\r
\n" ); document.write( "\n" ); document.write( ": one third of a certain journey was covered at the speed of 20 km per hour , one fourth at the rate of 30 km per hour and the rest at the rate of 50 km per hour.
\n" ); document.write( "Find the average speed ( per hour ) of the whole journey ? \n" ); document.write( "

Algebra.Com's Answer #820573 by ikleyn(52792) $\"\"$ $\"About$

You can put this solution on YOUR website!
.
\n" ); document.write( "one third of a certain journey was covered at the speed of 20 km per hour ,
\n" ); document.write( "one fourth at the rate of 30 km per hour and the rest at the rate of 50 km per hour.
\n" ); document.write( "Find the average speed ( per hour ) of the whole journey ?
\n" ); document.write( "~~~~~~~~~~~~~~~~\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " Calculations by @josgarithmetic have FATAL ERRORS, \r
\n" ); document.write( "\n" ); document.write( " so I came to bring a correct solution.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "

\r\n" );
document.write( "Let d be the distance.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Part  was covered at 20 km/h;  it took   =  hours.\r\n" );
document.write( "\r\n" );
document.write( "Part  was covered at 30 km/h;  it took   =  hours.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "The rest distance,   =   kilometers, was covered at 50 km/h;  \r\n" );
document.write( "\r\n" );
document.write( "                    it took  =  hours.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Total time is   =  =  = .\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Therefore, the average speed =  = 30 km/h.    ANSWER.  \r\n" );
document.write( "

\r
\n" ); document.write( "\n" ); document.write( "Solved.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "//////////////\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Do not accept any other answer.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );