If the flight takes 55 minutes to depart at 11: 45 what time is he expecting to arrive at new york

We know that
1 hour> 60 minutes
so

= [11:45 am] + 55 min 

= [11 h + 45 min + 55 min] am 

= [11 h + 100 min] am 

= [11 h + (60 + 40) min] am 

= [11 h + 60 min + 40 min] am → you know that: 60 min = 1 h 

= [11 h + 1 h + 40 min] am 

= [12 h + 40 min] → when you get 12, am → pm 

= 12:40 pm

the answer is
12:40 pm