A class there at 6:45 PM in the class ends at 10:25 PM how long is this class

Answer:4 hours an 40 minutes

Step-by-step explanation: i started out adding the hours together so the class started at 6:45 the 7:45 then 8:45 then 9:45 then i had to stop there an add 15 minutes to get to 10:00 then i adding another 25 minutes to get to 10:45