A machine completes a job in 2 hours. Its rate of work is:
Correct answer: A. 1/2
- A. 1/2
- B. 2
- C. 1
- D. 1/4
Explanation
The correct answer is 1/2. The machine completes one full job in 2 hours. Thus, in one hour, it completes half of the job, which is represented by the fraction 1/2. Option B is incorrect because a rate of 2 jobs per hour would imply the machine finishes a job in 30 minutes, not 2 hours. Option C is incorrect because completing 1 job per hour means finishing in 1 hour, contradicting the problem statement. Option D is incorrect because completing 1/4 of the job per hour would require 4 hours, not 2, to complete the entire job.
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