*in india, there are 3 types of railway gauges
- broad, metre and narrow. sometimes, broad
gauge lines are indicated as double track or
single track. on the double track, trains ply
on two sets of railway lines at all times while
on single tracks trains ply only on one set of
railway lines at regulated intervals. in
q. what do you by "regulates intervald"

Which barrier to economic development is shown in the following examples? i. the high rate of hiv infection in underdeveloped nations ii. the use of children as soldiers in uganda’s army in the early 2000s iii. low literacy rates in underdeveloped nations with limited exposure to adequate education a. foreign debt b. political instability c. widespread disease d. low levels of social welfare