I asked him questions about it. The other things were: 1) No database 2) Write code. Not just the methods showing the functionality. 3) Customer's allocation/deallocation was to be done by text input in the terminal. We had only 20 minutes, so I wrote the fleet management part, and didn't have time to implement the customer-allocation/returns part. The interviewer was Ok with extending the interview, but I wasn't, so it ended there.