It would've been better if you'd shown what you did. Maybe I could've pointed out your error or the

reason why you got stuck. You may be able to find your own mistake though.



Let distance between city C and city D be C

Then distance between city A and city B = C – 3,001

Since total of the distances is 7,849, then we get: C + C – 3,001 = 7,849

2C = 7,849 + 3,001

2C = 10,850

C, or distance between cities C and D = , or  miles 

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