When pedro called Gary, the call cost $1.58. If the rate for the call was 53 cents for the first three minutes and 15 cents for each additional minute or fraction thereof, how long did Pedro and gary talk?

Answer 1

.53 + .15[m-3] = 1.58
.15[m-3] = 1.05
[m-3] = 7
m-3 = 7
m = 10

check:

.53 + .15*7 = .53 + 1.05 = 1.58