we have that
equation Company A is
15x+3
that means------> service fee of $3 and $15 per hour for long distance
eqiation Company B is
14x+5
that means -----> service fee of $5 and $14 per hour for long distance
therefore
The answer is the option C
the other question
equate the equation A and equation B
15x+3=14x+5
solve for x
15x-14x=5-3
x=2 hours