A can do a task in 4 hours; B and C can complete it in 3 hours; and A and C can complete it in 2 hours. How long will it take B to finish it on his own?
A. 8 hours
B. 10 hours
C. 12 hours
D. 24 hours
Answer:C
A can do a task in 4 hours; B and C can complete it in 3 hours; and A and C can complete it in 2 hours. How long will it take B to finish it on his own?
A. 8 hours B. 10 hours C. 12 hours D. 24 hours
Explanation: 1 hour of labour by A = 1/4;1 hour of labour (B + C) = 1/3;1 hour of work (A + C) = 1/2=1 hour of work for (A + B + C) = ( 1/4 + 1/3 ) = 7/12=1 hour of work by B = ( 7/12 - 1/2 ) = 1/12.As a result, B alone will need 12 hours to complete the task.