Read the following table and answer the questions that follow: The Indian Railway network (3.1) Which gauge covers maximum of track length in hilly…

Read the following table and answer the questions that follow : The Indian Railway network

Gauge in metres	Route (km)	Running Track (km)	Total Track (km)
Broad Gauge ($\displaystyle 1.676$)	$\displaystyle 63{,}491$	$\displaystyle 89{,}521$	$\displaystyle 1{,}17{,}560$
Metre Gauge ($\displaystyle 1.000$)	$\displaystyle 3{,}200$	$\displaystyle 3{,}462$	$\displaystyle 3{,}775$
Narrow Gauge ($\displaystyle 0.762$ and $\displaystyle 0.610$)	$\displaystyle 1{,}751$	$\displaystyle 1{,}752$	$\displaystyle 1{,}901$
Total	$\displaystyle 68{,}442$	$\displaystyle 94{,}735$	$\displaystyle 1{,}23{,}236$

($\displaystyle 3.1$) Which gauge covers maximum of track length in hilly areas in India ? ($\displaystyle 3.2$) Which gauge has the highest length in India ?