A) \( \Large 3\frac{1}{2} \) |
B) \( \Large 3\frac{1}{4} \) |
C) \( \Large 4\frac{1}{2} \) |
D) \( \Large 4\frac{21}{3} \) |
D) \( \Large 4\frac{21}{3} \) |
Part of work done in two hours = \( \Large \frac{1}{4}+\frac{1}{6}=\frac{5}{12} \)
Part of work done in 4 hours = \( \Large 2 \left(\frac{5}{12}\right) = \frac{5}{6} \)
Therefore, required time = \( \Large 4 + \frac{\frac{1}{6}}{\frac{1}{4}} = 4\frac{2}{3} hours \)