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SSC CHSL 2025 PYQ — Question 61

SSC CHSL - 12 Nov 2025 - Shift 3 • Quantitative Aptitude • Q61

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A and B together can do a piece of work in 10 days. B alone can do it in 15 days. How long will A alone take to complete the work?

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Correct answer: C

Explanation

Time taken by A + B working together = 10 days
Time taken by B alone = 15 days
Work rate of A + B = 1/10
Work rate of B = 1/15
Work rate of A =110−115=3−230=130\frac{1}{10} - \frac{1}{15} = \frac{3 - 2}{30} = \frac{1}{30}
Time taken by A to complete the work = 30 days