A) 3-7 days 11 |
B) 11 days |
C) 3A days 11 |
D) 3-9 days 11 |
A) 3-7 days 11 |
A's 1 day's work = 1 / 8
B's 1 day's work = 1 / 10
C's 1 day's work = 1 / 20
(A + B + C)' s 1 day's work = \( \Large\frac{1}{8} + \frac{1}{10} + \frac{1}{20} = \frac{5 + 4 + 2}{40} = \frac{11}{40} \)
(A + B + C) can finish the work in 40 / 11 days or \( \Large3\frac{7}{11} \)days