Your project requires coordination between structural steel erection and concrete placement. The steel subcontractor can erect 50 tons per day, and you have 800 tons total. Concrete can be placed 2 days after steel erection begins in each area. If concrete crews need 12 days total, when should concrete operations start to finish simultaneously with steel?
Correct Answer
B) Day 6
Steel duration: 800 ÷ 50 = 16 days. Steel finishes day 16. Concrete needs 12 days and must finish day 16, so concrete starts day 5. With 2-day lag after steel start, concrete can begin day 3, but to finish simultaneously: 16 - 12 + 2 = day 6.
Why This Is the Correct Answer
Steel duration: 800 ÷ 50 = 16 days. Steel finishes day 16. Concrete needs 12 days and must finish day 16, so concrete starts day 5. With 2-day lag after steel start, concrete can begin day 3, but to finish simultaneously: 16 - 12 + 2 = day 6.
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