Question

What are the distance between two parallel lines?

Answer 1

HEY DEAR ...

The shortest distance between two parallel lines is said to be the perpendicular distance between these two, i.e. the length of perpendicular drawn from a point in one line to another is called the distance between two parallel lines.

HOPE , IT HELPS ...

Answer 2

there is no particular distance between parallel lines
the shortest distance would be the perpendicular distance
to make it clear
parallel lines are like tracks of a railway line it depends on the width of the train and on nothing else