Respuesta :

12:53 to 1:00 = 7 mins
1:00 to 1:15 = 15mins
 7 mins + 15 mins = 22 mins

So, you were 22 mins early for your meeting. 
Neuron
If you would like to know how many minutes early were you, you can calculate this using the following steps:

12:53 - 13:00 ... 7 minutes
13:00 - 13:15 ... 15 minutes
7 minutes + 15 minutes = 22 minutes

The correct result would be 22 minutes.