A welder completes a frame in 3 hours. He begins work but midway the power cuts and he completes the last third manually, taking 60% more time. Total time?
Correct answer: C. 3.6 hrs
- A. 3.2 hrs
- B. 3.4 hrs
- C. 3.6 hrs
- D. 3.8 hrs
Explanation
To solve this problem, note that the entire task is divided into three equal parts, each taking 1 hour with power. The welder completes two parts using power, taking 2 hours. For the last third, he works manually, which takes 60% more time than the usual 1 hour, resulting in 1.6 hours. Therefore, the total time taken is 2 hours (with power) + 1.6 hours (manual) = 3.6 hours.Option A (3.2 hrs) and Option B (3.4 hrs) underestimate the extra time required for manual work. Option D (3.8 hrs) overestimates this time.
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