I had quick screening with someone at director level who had a chat with me about my experience and qualifications and then I was selected for another interview at the next stage.

Scenario: You have two identical eggs which may or may not break when thrown from a window, depending on which floor they are thrown from.

How would you determine the highest floor from which an egg can be thrown without it breaking? You may break both eggs in order to determine the answer. If an egg is not broken it can be reused.

Start off with the basics and then tell us how you could refine the process and make it more efficient as you go.