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Solution

7) radius = 1250 kiliometres

R = 6400

total radius = 6400 + 1250 = 7650 km

changing 7650 km to metres = 7650000 m

one revolution takes 110 minutes

= 110 * 60 = 6600 seconds

angular velocity = 2pi/6600

= pi / 3300

linear velocity =  pi / 3300 * 7650000

linear velocity = 7279.09 m/s