Answer:
4 hours.
Step-by-step explanation:
Distance = speed * time.
They approach each other at 60 + 45 = 105 m/h.
In the first 2 hours Joseph travels 2*60 = 120 miles.
At this point they are 540 - 120 = 420 miles apart.
So, when they are moving towards each other we have the equation:
420 = 105 * time
--> time = 420 / 105
= 4 hours.
At this time they will meet, and Dominic will have travelled 4 hours.
