WBCS.LIVE practice question

Mohan takes 6 hours to do a job. Laltu takes 10 hours to do the same job. How long should it take if Mohan and Laltu work together the same job?

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

Answer options

  1. 112 hrs.
  2. 334 hrs.
  3. 213 hrs.
  4. 314 hrs.

Correct answer and explanation

Correct answer: 334 hrs.

Explanation: āœ… Correct Answer: B. 3 3/4 hrs. šŸ“š Explanation: Together, they complete (1/6 + 1/10) of the work in one hour. This equals (5 + 3) divided by 30, which is 8/30 or 4/15 of the total job. The time taken to finish the job is the reciprocal: 15/4 hours, which equals exactly '3 and 3/4 hours'. This is a standard work-and-time problem involving combined rates.