A car rental company offers two plans. Plan A has a daily fee of $30plus$0.15 per mile driven. Plan B has a daily fee of $45plus$0.10 per mile driven.

If a customer rents a car for one day and drives $m$ miles, the total cost for Plan A is $C_A=30+0.15m$, and for Plan B is $C_B=45+0.10m$.

Which of the following statements is true regarding the costs of the two plans?