exam Maths Puzzle Numerical Ability

Two buses leave Houston at the same time and travel in oppisite direction. One bus averages 55 mi/h and the other bus averages 45 mi/h. When will they be 400 mi apart?

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need help could u explain each step thanks

2x-y=6
x=13-2y equations by substitution

thank you so much homework
I need to justify each of these step, please help me with this.

5(n+4)+9n= (5n+20)+9n

=5n+(20+9n)
=5n+(9n+20)
=(5n+9n)+20
=(5+9)n+20
=14n+20