1.
    3. 
        path(1, 3, P).
        path(3, 5, P).
        path(5, 4, P).

2.
    1.
        findall(Cost, (path(5, 4, Path), cost(Path, Cost)), Costs).
    2.
        shortestPath(1, 3, Path).
        shortestPath(3, 5, Path).
        shortestPath(5, 4, Path).

3.
    1.
        diffTime(11:15, 13:21, Min).
    2.
        diffTime(11:08, 14:05, Min).

4.
    1.
        shortestPath("Amsterdam Science Park" at Start, "Den Bosch" at End, Schedule).
        diffTime(11:10, 12:38, Min).