defence exam DGAFMS Group C 2025 Mock Test Series Quantitative Aptitude Time and Work Work Efficiency
A can do a work in \(7 \frac{1}{2}\) hours and B can do the same work in \(10 \frac{1}{2}\) hours. If they work together for \(3 \frac{1}{2}\) hours, then what part of the work will be left out?
1
1/5
2
2/5
3
4/5
4
3/5