defence exam Army Havildar SAC Mock Test Series 2025 Quantitative Aptitude Time and Work Work Efficiency
A alone can finish a work in 15 days. A works only for the first two days and last two days. The rest work is done by B and the work is completed in 20 days. In how many days A and B together can finish the work?
1
\(\frac{90}{8}\)
2
\(\frac{80}{7}\)
3
\(\frac{80}{9}\)
4
\(\frac{70}{8}\)