Q. A completes a work in 21 days while B completes it in 28 days. Their combined time is:

  • (A) 11 days
  • (B) 12 days
  • (C) 13 days
  • (D) 14 days
✅ Correct Answer: (B) 12 days
Explanation: Combined rate = 1/21 + 1/28 = 1/12. Hence time = 12 days.

Published by Deepak Sahoo ⭐ 11.23K Points at 21-Jul-2026 06:20 am in Math

Explanation by: Deepak Sahoo
Combined rate = 1/21 + 1/28 = 1/12. Hence time = 12 days.

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