1 A line \(l\) has equation \(\frac { x - 1 } { 5 } = \frac { y - 6 } { 6 } = \frac { z + 3 } { - 7 }\) and a plane \(p\) has equation \(x + 2 y - z = 40\).
- Find the acute angle between \(l\) and \(p\).
- Find the perpendicular distance from the point \(( 1,6 , - 3 )\) to \(p\).