Fiber route factor

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Users in city X need a round trip under 22 ms. Site P is 1,500 km away, but its fiber runs 1.6 times that. Site Q is 1,800 km away on a 1.1 route. Site R is 1,200 km away, but the fiber goes through a hub: 900 km and 1,100 km, each at 1.2. Pick the site.

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Site P, 1,500 km away
Site Q, 1,800 km away
Site R, 1,200 km away