A can do a piece of work in 4 hours; B and C together can do it in 3 hours, while A and C together can do it in 2 hours. How long will B alone take to do it?
Answer & explanation
Correct answer: option 3
Using LCM method:
Efficiency of A = 3, B+C = 4, A+C = 6 B=?
A+C = 6, A = 3, C = 3
B+C = 4, C = 3, B = 1
B alone will do it in = \(\frac{12}{1}\) = 12 hours