BANK IBPS RRB PO Mock Test Series 2025 (Pre + Mains) Quantitative Aptitude Time and Work Work Efficiency
Given that A and B together can finish a task in 12.5 days, and B and C together can do it in 18.75 days, and also A and C together can do it in 15 days, how long would it take for A, B, C and D (with D having only 40% of C's efficiency) to complete the same task collectively?
1
9(1/3)
2
9(17/27)
3
9(2/3)
4
9(7/27)
5
9(1/3)