Multiple choice

Efficiency ratio of A, B and C is 3 : 2 : 4. If C alone can complete the work in 15 days, then in what time will A, B and C together finish (\frac{3}{4}) part of the same work?

  1. 4 days

  2. 5 days

  3. 6 days

  4. 8 days

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

With efficiency ratio 3:2:4 and C taking 15 days alone, total work equals 60 units. Together they complete 9 units per day (3+2+4), so 3/4 of work (45 units) takes exactly 5 days. Option A (4 days) would only complete 36 units, while options C and D exceed the required time.