Answer:
They'll walk 140.28 miles in 42 hours at that pace.
Step-by-step explanation:
In order to find the distance they can travel at a steady pace, we need to take the pace in wich they intend to travel and multiply it by the time that they intend to travel. In this case their pace is 5 miles every 1.5 hours it means that their pace is 5/1.5 = 3.34 m/h, if they travel for 42 hours they'll travel a distance of:
distance = 3.34*42 = 140.28 miles