Question 537
Well, first we need to work out how far they have travelled so far:

{{{(4/13) * 5200 = 1600}}}

Take that away from the total trip gives us the remaining distance:

{{{5200 - 1600 = 3600}}}

They have 10 days to cover 3600 miles, and we want to know how far they need to travel in 1 day:

{{{3600 / 10 = 360}}}

Therefore they need to travel an average of 360 miles a day for the remainder of the trip.