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SSC CHSL 2025 · PYQ · Time and Work · medium

A can do a work in 15 days, B in 30 days. They start together but A leaves after 5 days. In how many more days will B complete the remaining work?

Answer

The correct answer is C: 15 days. In 5 days together: (1/15+1/30)×5 = (2+1)/30 × 5 = 15/30 = 1/2 work done. Remaining = 1/2.

  1. A.6 days
  2. B.8 days
  3. C.15 days✓ Correct
  4. D.7 days

Explanation

In 5 days together: (1/15+1/30)×5 = (2+1)/30 × 5 = 15/30 = 1/2 work done. Remaining = 1/2. B alone: (1/2)/(1/30) = 15 days.
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