document.write( "Question 1168449: The local post office has three machines for sorting the mail. If each works alone, machine A can accomplish the job in 2 hours, machine B in 3hours and machine C in 1 1/2 hours. Machine C begins the job and works for half an hour when it suddenly breaks down. Machine A and B are then activated and work together to complete the sorting process. How long does it take for machines A and B to finish. \n" ); document.write( "

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\n" ); document.write( "The local post office has three machines for sorting the mail. If each works alone, machine A can accomplish the job in 2 hours, machine B in 3hours and machine C in 1 1/2 hours. Machine C begins the job and works for half an hour when it suddenly breaks down. Machine A and B are then activated and work together to complete the sorting process. How long does it take for machines A and B to finish.
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Machine A does job in 2 hours, or  of job in 1 hour\r\n" );
document.write( "Machine B does job in 3 hours, or  of job in 1 hour\r\n" );
document.write( "Machine C does job in  hours, or  of job in 1 hour\r\n" );
document.write( "With machine C working for  hour, and with T being the time machines A & B take to finish the job, we get: \r\n" );
document.write( "2 + 3T + 2T = 6 ------- Multiplying by LCD, 6\r\n" );
document.write( "3T + 2T = 6 - 2\r\n" );
document.write( "5T = 4\r\n" );
document.write( "Time machines A and B took to complete job, or

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