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a) stacie and nick fold napkin while jeff and tiffany set table
^ Yeah, agreed. Lol, now that I look at it, 'a)' is very easy...
jeff and tiffany done their job first in 61.25min not sure it this right
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^ Thanks, still gotta do it myself, I'll keep these answers in consideration.
wait that was a wrong one Xd, arithmetic error, here the explanation:
first we know that jeff and tiffany will done their jobs first, and their work rate is:
(4/3)table per min and (4/2)table per min, when they do works together, the work rate is 4/3+4/2 = 10/3
Now we can find the progress of the other 2 pair when jeff and tifany done their place setting job:
rate of work of stacie and nick : 4/3 + 4/3.5 = 52/21
x is the number of table completed when jeff and tiffany done their setting job.
that mean 81/7 of table left undone( 45 - 234/7 = 81/7)
now tiffany and jeff will help the other two and the work rate is :
4/3+4/4+4/5+4/3.5 = 449/105
so the total time to complete all 45 tables for both folding and setting is:
time taken = 13.5min + 1215/449 min
i think this right