WBCS.LIVE practice question

12 workers take 4 hours to complete a job. How long would it take 15 workers to complete the job?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 2 hrs. 40 mins.
  2. 3 hrs. 12 mins.
  3. 3 hrs. 24 mins.
  4. 3 hrs. 30 mins.

Correct answer and explanation

Correct answer: 3 hrs. 12 mins.

Explanation: āœ… Correct Answer: B) 3 hrs. 12 mins. šŸ“š Explanation: The total work can be measured in worker-hours, which is 12 workers multiplied by 4 hours, totaling 48 units. To find the new time, we divide this total work by the new number of workers. Dividing 48 by 15 gives 3.2 hours. Since 0.2 of an hour is 12 minutes, the total time taken by 15 workers is 3 hours and 12 minutes.