state gov RSMSSB Junior Assistant & Lipik Grade (LDC) Mock Test 2024 Quantitative Aptitude Time and Work Work Efficiency
A and B can separately finish a work in 15 and 20 days, respectively. A starts the work and B joins him from the fifth day. How much time will it take to finish the complete work?
1
\(10\frac{2}{7}\) days
2
\(11\frac{3}{7}\) days
3
11 days
4
10 days