laurab

The concept behind triangular arbitrage is simple, but if they throw bid-ask spreads at you in the problem, it’s going to be a bear to solve, and quite honestly it’s going to take some luck in choosing the right pair to analyze in the right direction to solve it quickly.
More likely, they will ask you the problem without bid/ask rates, which simplifies the problem, and the penalty for choosing the wrong pair to start with (mostly a luck issue) is about 10 seconds, rather than 30.