Answer with explanation:
Total length of road \(=\frac{2 \text{miles}}{5}\)
Amount Repaved per Hour
\(=\frac{1 \frac{\text{miles}}{\text{hour}}}{30}\)
Using Unitary method
\(\Rightarrow 1 \text{hour}=\frac{1 \text{miles}}{30}\\\\\Rightarrow 30 \text{hour}=1 \text{miles}}\\\\\Rightarrow \frac{2\text{miles}}{5}=30 \times \frac{2}{5} \text{hour}\\\\\Rightarrow \frac{2\text{miles}}{5}=12 \text{hour}\)
Total time taken by crew to repave the road= 12 hour