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 1
During a constructability walkdown for the Riverbend water main crossing operations upgrade project, the construction manager schedules 800 units of work with 2 crews, each producing 55 units/day. What duration is required?
- A4.38 days
- B8.02 days
- C9.31 days
- D7.27 days
Show the answer and worked solution
Answer: D — 7.27 days
Worked solution
- Step 1. Divide total work by combined production
duration = work/(crews x production)
duration = 800/(2 x 55) = 7.27 days
Why the other choices are wrong
- Choice A
- Nothing in the standard crew-production procedure lands on this middle duration through one clean step, so it should be treated as unverified rather than explained by a specific slip; the verified computation, work / (crews x production) using 800, 2, and 55, equals 7.27 days.
- Choice B
- This shorter duration does not fall out of any standard slip in the productivity formula, so its source cannot be pinned to a specific substitution; recomputing duration = work / (crews x production) with 800, 2, and 55 gives 7.27 days, which is the only defensible value here.
- Choice C
- The much longer duration shown here does not emerge from a single traceable mistake in the scheduling formula, and no consistent substitution explains the gap; working duration = work / (crews x production) with 800, 2, and 55 correctly produces 7.27 days.