Can you find a simple answer to the second question from the interview?

Question

Software testing

QA interview:
The plane leaves point A at 17:00 and arrives at point B at 19:00. At the same time, it is in flight for three hours. Why can this be?
How to make it so that, having received an updated application, competitors could not learn its new features?

Answer 1

How to make it so that, having received an updated application, competitors could not learn its new features?

Feature switches The application can be updated and be with new features, but they will be disabled, and the switches are not on the client side so that competitors can find out or the media or no matter who, but on the backend side - each time the application will request this list. And managing the backend - you can test, enable by release / event.
In addition to the fact that no one will know, it is also possible to make sure that features will be included on a part of users in order to be tested for combat users and rolled out as they are confident on an increasing and increasing share.

Answer 2

1. Time zone
2. Time tail