Original question written by FE Exam AI Prep from the public FE Civil exam specification. Before release, a solver model re-derived the answer twice from the question alone, without its answer key, and a critic model checked the result, and the arithmetic was re-run as an executable calculation. No licensed engineer reviews these questions. It is not an NCEES question and does not come from any NCEES practice exam. FE Exam AI Prep is an independent study tool and is not affiliated with, endorsed by, or sponsored by NCEES.
Activity Duration from Production Rate: FE Civil practice problem 5
For the Mill Creek bridge widening, a materials reviewer preparing a construction-phase calculation record schedules 800 units of work with 2 crews, each producing 35 units/day. What duration is required?
- A7.83 days
- B11.43 days
- C9.26 days
- D12.61 days
Show the answer and worked solution
Answer: B — 11.43 days
Worked solution
- Step 1. Divide total work by combined production
duration = work/(crews x production)
duration = 800/(2 x 35) = 11.43 days
Why the other choices are wrong
- Choice A
- Dividing 800 units by the combined output of 2 crews at 35 units per day gives a duration well below this total, and the jump is not explained by one obvious dropped step, so the smaller value is the one to rely on.
- Choice C
- This total runs somewhat above 800/(2 * 35), and the difference does not follow from one traceable arithmetic slip in the work-over-crew-output division, so the smaller duration from that direct calculation is the one to trust.
- Choice D
- This total falls short of 800/(2 * 35), and the shortfall is not traceable to one clean arithmetic slip in the work-over-crew-output division, so the larger duration from that direct calculation is the one the data supports.