document.write( "Question 1122780: Sameera Travels by coach from Singapore to penang which is 700 kilometres apart to visit our grandparents. He returned to Singapore by car at an average speed which is 30 km per hour greater than that of a coach
\n" ); document.write( "i) if the average speed of the car is x km per hour in the time taken for the whole journey is 20 hours, formulate an equation in x and show that it reduces to x^2-100x+1050=0
\n" ); document.write( "ii) solve the equation x^2-100x+1050=0
\n" ); document.write( "iii) Fime the time taken fot the return journey \n" ); document.write( "

Algebra.Com's Answer #738955 by josgarithmetic(39629) $\"\"$ $\"About$

You can put this solution on YOUR website!

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document.write( "                     SPEED       TIME         DISTANCE\r\n" );
document.write( "S to P               r           700/r           700\r\n" );
document.write( "P to S               r+30        700/(r+30)      700\r\n" );
document.write( "TOTAL                             20\r\n" );
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\n" ); document.write( "\n" ); document.write( " $\"highlight_green%28700%2Fr%2B700%2F%28r%2B30%29=20%29\"$ -----equation to solve, first for r.\r
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\n" ); document.write( "\n" ); document.write( "The AVERGAE speed for the whole journey is $\"1400%2F20=70\"$ , kilometers per hour. \n" ); document.write( "

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