Multiple choice

R and S undertake to do a piece of work for Rs.7200. R alone can do it in 8 days and S alone can do it in 12 days. With the help of K they finish it in 4 days. Then the share of K in rupees is -

  1. Rs.1200

  2. Rs.3000

  3. Rs.3600

  4. Rs.2400

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

R's 1-day work = 1/8, S's 1-day work = 1/12. Combined rate of R+S+K = 1/4. So K's 1-day work = 1/4 - 1/8 - 1/12 = 1/24. In 4 days, K completes 4 × 1/24 = 1/6 of total work. Therefore K's share = 7200 × 1/6 = Rs.1200. Option A is correct.

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