state gov Allahabad High Court Group D Mock Test Series 2024 Quantitative Aptitude Time and Work Work Efficiency
A can do a piece of work in 7 hours, B and C can do it in 21/4 hours, and C and A can do it in 7/2 hours. How long will B alone take to do it?
1
24 hours
2
21 hours
3
20 hours
4
22 hours