Case: A uber like company wants to enter a city, what are factors you want to consider. They then gave numbers and we had to calculate break even price, profit, basic calculations.

Behavioural: tell me about a time that you overcame barriers and challenges in order to deliver a project on time

how can I respond to it?

Does your text give any indication what kind of investment an Uber-like company has to make in a new market? What do they have to invest in, how much does that infrastructure cost? Without baseline figures, the first question is incomplete.

For the second question, you are asked for personal experience. Only you can provide that.