Two satellites move in circular orbits around the earth at distances \( 9000 \mathrm{~km} \) and...

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Two satellites move in circular orbits around the earth at distances \( 9000 \mathrm{~km} \) and \( 9010 \mathrm{~km} \) from earth's centre. If the satellite which is moving faster has a period of revolution 90 minutes. Find the difference in their revolution periods.
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