24 miles is the right answer.

Here is one way to work this (thanks originally to rhyme for the style of operation), while it may seem a little long, it's pretty fast and accurate once you get used to it.

Use d = st, let's ignore the 4 hours of rest because it does not count. The real travel time is 11 hours

so,

A B

d x x

s 8 3

t 11-t t

since distance is equal,

8(11-t) = 3t => 88-8t = 3t => 88 = 11t => t = 8

substituting above,

A B

d 24 24

s 8 3

t 3 8

Distance between cities is 24.

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