Q. A completes a work in 45 days and B in 30 days. Their combined efficiency is:

  • (A) 1/15
  • (B) 1/18
  • (C) 1/20
  • (D) 2/45
✅ Correct Answer: (B) 1/18
Explanation: Combined rate = 1/45 + 1/30 = 1/18? LCM 90: 2/90 + 3/90 = 5/90 = 1/18.

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

Explanation by: Deepak Sahoo
Combined rate = 1/45 + 1/30 = 1/18? LCM 90: 2/90 + 3/90 = 5/90 = 1/18.

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