Discussion

Explanation:

Total distance to be travelled, chord N₁– W₂ + W₂– E₂ arc of the Inner Ring road

Given the speeds,

Total time required to travel from N₁ to E₂ = $\frac{\sqrt{5}r}{15\sqrt{5}}+\frac{\pi r}{20\pi }$

$=\frac{r}{15}+\frac{r}{20}$

$$\begin{gathered} =\frac{35r}{300} \\ =\frac{35\times 15}{300} \\ = \frac{7}{4} \mathrm{hrs} \end{gathered}$$

= 105 minutes

Hence, option (d).

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