document.write( "Question 1006274: Joseph does the laundry in 15 minutes. Mark takes 4 minutes more to do the laundry on his own than when he does it with Joseph. How long does it take when Mark and Joseph do the laundry together?\r
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Algebra.Com's Answer #622432 by MathTherapy(10552) $\"\"$ $\"About$

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Let time it takes both, be B
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document.write( "Then both can do  of laundry in 1 minute 
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document.write( "Mark can do laundry in B + 4 minutes, or  of laundry in 1 minute
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document.write( "Joseph can do laundry in 15 minutes, or  of laundry in 1 minute
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document.write( "We then get: 
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document.write( "15B + B(B + 4) = 15(B + 4) ------ Multiplying by LCD, 15B(B + 4)
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document.write( "(B - 6)(B + 10) = 0 
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document.write( "B, or both can do laundry in:  minutes	   OR	         B = - 10 (ignore) \n" );
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