Many Hollywood beautiful women prove the age is just a number.
Everything happens for a reason.
Journey describes travelling from one place to another over a considerable distance. That’s why in the test sentence we are talking about is a three day journey.
Trip is often travelling to a place and coming back the same day and so it is not usually long. You are staying in a hotel on holiday and the travel company representative will organise trips to places of interest and you will come back to the hotel that day for your evening meal.
Tour describes travelling from one place after another over a period of days/weeks and visiting various towns/cities and in the end coming back to where you started. This is also a word used on the internet sometimes described as a virtual tour when you are shown a series of pictures describing the site you are looking at.
A tour takes in several places and to travel is the journey getting there