Charmaine is going to rent a truck for one day. There are two companies she can choose from, and they have the following prices. Company A has no initial fee but charges 70 cents for every mile driven. Company B charges an initial fee of $50 and an additional 20 cents for every mile driven. For what mileages will company A charge more than company B? Use m for the number of miles driven, and solve your inequality for m.