Jo has an appointment at 5pm. She has to travel 6 miles and will drive at an average speed of 20 mph.
To arrive exactly on time, what time should she leave?
Give your answer as a time on the 24-hour clock.

Atruck can be rented from company a $50 a day plus $0.60 per mile. company b charges $20 a day plus $0.80 per mile to rent the same truck. find the number of miles in a day at which the rental costs for company a and company b are the same