Air pollution in metropolitan cities primarily arises due to vehicular emissions and industrial activities. To effectively control air pollution, practical measures must focus on reducing the use of fossil fuel-driven vehicles and promoting cleaner and efficient modes of transport.
Combining Metro Rail and CNG Buses offers a practical, sustainable solution for mitigating air pollution in cities.
Other options, although beneficial, either lack the emphasis on cleaner fuel (like Ring Railway) or on reducing individual vehicle use as effectively as Metro and CNG.
A racing track is built around an elliptical ground whose equation is given by \[ 9x^2 + 16y^2 = 144 \] The width of the track is \(3\) m as shown. Based on the given information answer the following: 
(i) Express \(y\) as a function of \(x\) from the given equation of ellipse.
(ii) Integrate the function obtained in (i) with respect to \(x\).
(iii)(a) Find the area of the region enclosed within the elliptical ground excluding the track using integration.
OR
(iii)(b) Write the coordinates of the points \(P\) and \(Q\) where the outer edge of the track cuts \(x\)-axis and \(y\)-axis in first quadrant and find the area of triangle formed by points \(P,O,Q\).