Solution (in English)

-> Use Input variable as Availabletime

->use 2nd input variable as Land in smiths field

->calculate availabletime with 20, store it in a variable called Arrival01

->calculate Land in smiths fiend with 45, store it in variable called Arrival02

->If   variable is Availabletime then display book taxi and reservation at Arrival01

-> Else display book airfield loaner and reservation at Arrival02

End