Answer:
1020 miles
Explanation:
We can lay a map like this (shown below):
Washington DC --------------> Rome, Italy ---------------->Sochi, Russia
From Washington DC to Rome is 4480
From Washington DC to Sochi is 5500
Now, we have:
Washington DC --------4480---------> Rome, Italy ---------------->Sochi, Russia
|--------------------------------------------------------5500-----------------------------------------|
THus, from Rome to Sochi is 5500 - 4480 = 1020 miles