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.
EASYduration = quantity/rate
Activity Duration from Production Rate: FE Civil practice problem 7
For the Oak Point bridge widening, a civil analyst preparing an agency resubmittal package schedules 920 units of work with 5 crews, each producing 70 units/day. What duration is required?
- A1.75 days
- B2.08 days
- C2.29 days
- D2.63 days
Show the answer and worked solution
Answer: D — 2.63 days
Worked solution
- Step 1. Divide total work by combined production
duration = work/(crews x production)
duration = 920/(5 x 70) = 2.63 days
Why the other choices are wrong
- Choice A
- This figure exceeds what dividing 920 by the combined crew output of 5 times 70 actually returns, and the gap is not explained by one obvious substitution error, so the smaller result from the direct division should be used.
- Choice B
- This total falls short of 920/(5 * 70), 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.
- Choice C
- This duration sits well above what 920 divided by 5 times 70 actually returns, and the size of the gap does not trace back to one clean substitution error, so the smaller result from the direct division should be treated as correct.