Algebra.Com's Answer #832333 by ikleyn(52781)![\"\"](\"/images/stars/stars-13.gif\")  
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document.write( "With two reapers operating, a field can be harvested in 1 h.
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document.write( "If only the newer reaper is used, the crop can be harvested in 1.5 h.
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document.write( "How long would it take to harvest the field using only the older reaper?
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document.write( "The combined rate of work of two reapers is  = 1 job per hour.\r\n" );
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document.write( "The individual rate of work of the new reaper is \r\n" );
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document.write( " 1_field/1.5_hours =  =  =  of the job per hour.\r\n" );
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document.write( "Hence, the rate of work of the old reaper is 1 - 2/3 = 1/3 of the job per jour.\r\n" );
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document.write( "It means that the field can be harvested in 3 hours, if only old reaper is used.\r\n" );
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document.write( "ANSWER. 3 hours.\r\n" );
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document.write( "Solved.\r
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