Time question

1. The problem statement, all variables and given/known data
The average speed of an orbiting satellite is 20,000 mph. How much time is required for the satellite to orbit Earth? (the satellite is orbiting 250 miles above the Earth’s surface, and remember that the Earth has a radius of 3,963 miles.)

2. Relevant equations
t=d/v
2∏(r)

3. The attempt at a solution
3963+250=4213

2∏(4213)
6.28(4213)
26457.84 miles

26457.64/20000
=1.32 hours*60mins
=79.2 mins

Did I do this correctly?

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