Quantitative Aptitude • Time, Speed & WorkEasy
A can finish a piece of work in 12 days and B can finish it in 24 days. How many days will they take working together?
A. 18 days
B. 8 days✓ Correct Answer
C. 36 days
D. 12 days
💡 Solution & Explanation
In one day A does 1/12 of the work and B does 1/24. Together they do 1/12 + 1/24 = 1/8 of the work per day. So the whole work takes 8 days. Shortcut: ab ÷ (a + b) = 288 ÷ 36 = 8. Together they must be faster than either one alone.
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