What is the significance of an ATC clearance which reads “… CRUISE SIX THOUSAND …”?

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Which rules apply to the pilot in command when operating on a VFR on Top clearance?

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When a pilot elects to proceed to the selected alternate airport, which minimums apply for landing at the alternate?

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What is the pilot in command’s responsibility when flying a propeller aircraft within 20 miles of the airport of intended landing and ATC requests the pilot to reduce speed to 160? (Pilot complies with speed adjustment.)

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What point at the destination should be used to compute estimated time en route on an IFR flight plan?

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