Question 1133422
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The time is takes to build a skyscraper is proportional to its height and inversely proportional to the number of construction workers.
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n, construction workers
x, time
h, height
k, proportionality constant


{{{x=kh/n}}}



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If it takes 10 workers 2.5 years to build a 20 story building, how long will it take 40 workers to build a 60 story building? 
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{{{system(n=10,x=2.5,h=20)}}}
Use these to find value for k, and then ,.... continue and finish.