[zkmon]

The overall journey matters. For example, for some flight journeys, the flight-time is only a fraction of the overall time taken by the journey, which could makes it faster if you use road or rail transport. Flight speed doesn't matter.

[kryptiskt]

But that is an unanswerable question which depends on how the data structure is used. The reasonable thing is to calculate the cost for the operations separately and let whoever uses the algorithms figure out what that means for their use case.