A rocket travels at an approximate speed of 7.9 kilometers per second. Which statements about the rocket are true?

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The rocket travels at an approximate speed of 79 billion centimeters per second.
The rocket travels approximately 7.9×106 centimeters in 100 seconds.
The rocket travels approximately 7.9×103 kilometers in 100 seconds.
The rocket travels at an approximate speed of 7.9×105 centimeters per second.
The rocket travels approximately 7.9×105 meters in 100 seconds.
The rocket travels at an approximate speed of 7.9 million millimeters per second.