So let's take this question step by step:
Toronto Bus Terminal at 8:10am but was 25 minutes late
8:10am + 25 minutes = 8:35am
The trip from Montreal from Toronto takes 7.6 Hours, that would equal = 7 Hours and 36 minutes (seconds, minutes, hours)
8:35 am + 7 Hours and 36 minutes = 15:46:00 = 3:46pm
That should be the time it reaches to Montreal Bus Terminal 3:46pm