Quantitative Aptitude • Time, Speed & WorkHard
A can do a job in 20 days and B in 30 days. They work together for 6 days, and then A leaves. In how many more days will B finish the job?
A. 24 days
B. 14 days
C. 21 days
D. 15 days✓ Correct Answer
💡 Solution & Explanation
Together they do 1/20 + 1/30 = 1/12 of the job per day, so in 6 days they finish 1/2 of it. The part left is 1/2 of the job. B alone does 1/30 of the job per day, so B needs 1/2 × 30 = 15 more days.
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