If a repair shop receives 15 American cars per day and their mechanics work 7 hours a day, on average their mechanics should spend the following time fixing each Chevy: 28 mins / car 26 mins /car 30 mins /car 32 mins /car? 1) 28 mins / car 2) 26 mins /car 3) 30 mins /car 4) 32 mins /car