Question

I set off at 7:40 am my journey takes 45 min when do I arrive

Answer 1

heya answer is here......

=7:40+45
=8:25am......



may be this is help u

Answer 2

Just add 40 & 45. 40+45 = 85. Subtract 60 as 1 hour = 60 min. 85-60 = 20. At the same time you have to add an hour. So, it is 8:20. 
So, you have to add minutes, subtract 60 from the sum & add one hour to the time