state gov UP Police Head Operator (Radio Cadre) Mock Test Quantitative Aptitude Time and Work Work Efficiency
To do a certain work, efficiencies of A and B are in the ratio 7 : 5. Working together, they can complete the work in \(17 \frac{1}{2}\) days. In how many days, will B alone complete 50% of the same work?
1
42
2
30
3
15
4
21