A) 30 h |
B) 45 h |
C) 60 h |
D) 64 h |
C) 60 h |
Mason's 1 h work = \( \Large \frac{1}{12} \)
Mason's 6 h work = \( \Large \frac{6}{12} \)=\( \Large \frac{1}{2} \)
Remaining work = \( \Large 1-\frac{1}{2} \)=\( \Large \frac{1}{2} \)
Remaining work can be finished in 5 h total
work can be finished in \( \Large 2\times 5 \) = 10 h.
\( \Large \frac{1}{12}+\frac{1}{B}=\frac{1}{10} \)=>\( \Large \frac{1}{B}=\frac{1}{10}-\frac{1}{12}=\frac{1}{60} \)
Boy can complete the work in 60 h.