Heavy Equipment Operator Certification Exam Prep · Question
A municipality specifies a road crown of 2.5% on a 9-metre wide road. If the grader operator maintains an average speed of 4 km/h while crowning, and needs to complete 4 passes to achieve the final shape, how long will it take to crown a 1 km section of road?
First, calculate time per pass: Length of road = 1 km = 1000 m. Speed = 4 km/h. Time for one pass = Distance / Speed = 1 km / 4 km/h = 0.25 hours.0.25 hours * 6
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Question: A municipality specifies a road crown of 2.5% on a 9-metre wide road. If the grader operator maintains an average speed of 4 km/h while crowning, and needs to complete 4 passes to achieve the final shape, how long will it take to crown a 1 km section of road?
Answer options:
- 1 hour 30 minutes ✅ 1 hour
- 4 hours
- 30 minutes
Correct answer: 1 hour
Explanation: First, calculate time per pass: Length of road = 1 km = 1000 m. Speed = 4 km/h. Time for one pass = Distance / Speed = 1 km / 4 km/h = 0.25 hours.0.25 hours * 60 minutes/hour = 15 minutes per pass. Total time for 4 passes = 15 minutes/pass * 4 passes = 60 minutes, or 1 hour. This calculation is independent of the crown percentage or width, focusing solely on the operational task time.
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