A contractor estimates that 2,500 linear feet of electrical conduit installation will require 125 labor hours. What is the productivity rate in linear feet per hour?
Correct Answer
C) 20 linear feet per hour
Productivity rate = Total quantity ÷ Total hours = 2,500 linear feet ÷ 125 hours = 20 linear feet per hour. This rate can be used for estimating similar electrical conduit installation work on future projects.
Why This Is the Correct Answer
The productivity rate is calculated by dividing the total quantity of work by the total time required to complete it. In this case, 2,500 linear feet of conduit divided by 125 labor hours equals 20 linear feet per hour. This represents the rate at which workers can install electrical conduit under the given conditions. This metric is essential for accurate project scheduling and cost estimation in electrical work.
Why the Other Options Are Wrong
Option B: 15 linear feet per hour
This answer of 25 would result from dividing 125 into 2,500 incorrectly, possibly by miscalculating or confusing the order of operations in the productivity formula.
Option D: 25 linear feet per hour
This answer results from incorrectly calculating 2,500 ÷ 125 = 15, which is mathematically incorrect. The proper division yields 20, not 15.
Memory Technique
Remember 'QTT' - Quantity over Time equals Total productivity rate. Always put the work quantity on top and time on bottom when dividing.
Reference Hint
Look up productivity rates and labor estimating in construction management chapters, typically found in sections covering project scheduling and cost estimation.
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