Answer: $4.50 for 45min is better.
Step-by-step explanation:
The fee per min for phone charge of $1.40 for 10 min: 1.40/10 = $0.14/min
The fee per min for phone charge of $4.50 for 45 min: 4.50/45 = $0.1/min
$0.14/ min > $0.1/min
4.50 for 45min is better.
