Question 259736
$1 20 minutes +.07 
.06 per minute

20 minutes each
$1 for a
1.20 for b
now to find where they are the same after those 20 minutes
7x=6x+20
x=20
after 20 MORE minutes they are equal
1+20*.07=1.20+.06*20
2.40=1.20+1.20
2.40=2.40
A 40 minute call will cost the same on both carriers.