
Explanation:
Box 1: 3
It scales up by one after 10 minutes. So after 10 minutes 1 is added, but it won't add another for another 10 minutes and only 5 more minutes have passed, so the answer is 3.
Box 2: 1
After creating a scale set, go the the resource, click Scaling under Settings and open the scale in rule. You will find Duration(minutes) is defaulted to 5. I tested this scenario just to check the default duration because at the time of creating the VMSS on the portal you don't get an option to choose duration for Scal in.