railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Time and Work Work Efficiency
Two persons A and B working separately can sanitise a building in 6 and 10 hours, respectively. They work in stretches of one hour alternately. If A begins at 8 a.m., when will the work be finished?
1
9\(\frac{1}{3}\) h
2
7\(\frac{1}{3}\) h
3
6\(\frac{1}{3}\) h
4
8\(\frac{1}{3}\) h