engineering recuitment OSSC Combined Technical Services (ଓଡିଶା) Mock Test 2023-24 Quantitative Aptitude Time and Work Work Efficiency
Two workers A and B can construct a wall in 10 hours and 20 hours respectively and a third worker C can destroy the same wall in 5 hours. A and B start constructing the wall, after 6 hours C joins them. After what time the wall will cease to exist?
1
16 hours
2
27 hours
3
18 hours
4
9 hours