Algebra word problem

Dal and Kim can assemble a swing set in 3.5 hours. Working alone, it takes Kim 4 hr longer than Dal to assemble the swing set.  How long would it take Dal, working alone, to assemble the swing set?
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2 Answers

 

Dal and Kim can assemble a swing set in 1 1/2 hours. Working alone, it takes Kim 4 hr longer than Dal to assemble the swing set.  How long would it take Dal, working alone, to assemble the swing set?
 

 

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