Data:
Persons = 5
Ahmad, Ali, Akbar, Nasir and Shehbaz

Cities = 5
V, W, X, Y and Z

Modes of Transport = 5
Bus, Train, Aeroplane, Car and Boat

Scenario:

Person : Mode of Transport : City
Akbar : Car : Y
Ali : Aeroplane : X
Nasir : Boat :
Shehbaz : Train :

Bus ≠ X, W
Boat ≠ X

So,
The remaining mode of transport is now Bus
and the remaining person is Ahmad
so, Ahmad must traveled by Bus
and
Remaining Cities are X, W and Z

Therefore,
Person : Mode of Transport : City
Akbar : Car : Y
Ali : Aeroplane : X
Nasir : Boat :
Shehbaz : Train :
Ahmad : Bus :

As there is no Bus Service towards X and W.
So, there is two possibilities which are:

#1
Person : Mode of Transport : City
Akbar : Car : Y
Ali : Aeroplane : X
Nasir : Boat : W
Shehbaz : Train :
Ahmad : Bus :

#2
Person : Mode of Transport : City
Akbar : Car : Y
Ali : Aeroplane : X
Nasir : Boat :
Shehbaz : Train : W
Ahmad : Bus :

So, Now There is two further possibilities of each case (#1 and #2) having total of 4 possibilities or scenario

#1
[Possibility 1]
Person : Mode of Transport : City
Akbar : Car : Y
Ali : Aeroplane : X
Nasir : Boat : W
Shehbaz : Train : V
Ahmad : Bus : Z

#1
[Possibility 2]
Person : Mode of Transport : City
Akbar : Car : Y
Ali : Aeroplane : X
Nasir : Boat : W
Shehbaz : Train : Z
Ahmad : Bus : V

#2
[Possibility 3]
Person : Mode of Transport : City
Akbar : Car : Y
Ali : Aeroplane : X
Nasir : Boat : V
Shehbaz : Train : W
Ahmad : Bus : Z

#2
[Possibility 4]
Person : Mode of Transport : City
Akbar : Car : Y
Ali : Aeroplane : X
Nasir : Boat : Z
Shehbaz : Train : W
Ahmad : Bus : V

Questions:
i. How did Ahmed travel and where did he go?
So, by viewing these 4 Possibilities
Ahmed must traveled through Bus to either go to the City V or Z.

ii. Which mode of transport was used by the person who traveled to X city?
In every possibility
Ali traveled through Aeroplane to reach the city X.