At a particular car park the price for parking is based on the amount of time that the car will be parked for. the charge is 1 cent for every 2 minutes for stays of 3 hours or less. the charge is then 1 cent for every 3 minutes of any amount of time after that. customers pay money into a machine which three issues a ticket for the amount of time that has been paid for. no charge is issued. alexander is parking his car and need to park for 2 hours and 30 minutes, but only has $1 coin. how many additional minutes will he pay for?