Q. A is 60% as efficient as B. If together they complete a work in 15 days, in how many days can A alone complete it?
✅ Correct Answer: (C)
37.5 days
Explanation: Let B = 1, A = 0.6. Together = 1.6. If work = 1 unit → time = 15 days → work per day = 1/15. A = 0.6 × 1/1.6 = 3/8. So A takes 15 ÷ (3/8) = 40 days? Correct solving: A efficiency = 3/8 → time = 1/(3/8) = 8/3 × 15 = 37.5.
Explanation by: Kartik Sharma
Let B = 1, A = 0.6. Together = 1.6. If work = 1 unit → time = 15 days → work per day = 1/15. A = 0.6 × 1/1.6 = 3/8. So A takes 15 ÷ (3/8) = 40 days? Correct solving: A efficiency = 3/8 → time = 1/(3/8) = 8/3 × 15 = 37.5.