Melissa purchased a prepaid phone card for $ 15 . Long distance calls cost 6 cents a minute using this card. Melissa used her card only once to make...

Melissa purchased a prepaid phone card for $

15

. Long distance calls cost 6

 cents a minute using this card. Melissa used her card only once to make a long distance call. If the remaining credit on her card is $

14.34

, how many minutes did her call last